| January 1 | Earl Claus von Stauffenberg promoted to 2nd lieutenant |
| January 1 | Jurgens and Van den Berg merge with Lever Brothers to form Unilever |
| January 5 | Mao Tse-tung writes "A Single Spark Can Start a Prairie Fire" |
| January 6 | 1st diesel engine automobile trip (in a Packard sedan) completed |
| January 6 | Bradman scores 452* for NSW against Qld, 377 minutes, 49 fours |
| January 7 | Edwin Justus Mayer's "Children of Darkness," premieres in New York City |
| January 8 | Belgium Princess Marie-Jose marries Italian's crown prince Umberto |
| January 9 | Boston Bruins wins then NHL record 14th straight game |
| January 10 | Commencement of New Zealand's 1st Test, vs. England Christchurch |
| January 10 | Maurice Allom takes Test hat-trick England vs. New Zealand Christchurch |
| January 10 | Mordovian Autonomous Region in RSFSR constituted |
| January 12 | NHL's Boston Bruins win then-record 14th consecutive game |
| January 13 | "Mickey Mouse" comic strip 1st appears |
| January 15 | George Headley scores century on debut vs. England (made 176) |
| January 18 | -27 degrees F (-33 degrees C), Watts, Oklahoma (state record) |
| January 18 | Shostakovich' opera "The Nose," premieres in Leningrad |
| January 20 | 1st radio broadcast of "Lone Ranger" (WXYZ-Detroit) |
| January 22 | -35 degrees F (-37 degrees C), Mount Carroll, Illinois (state record) |
| January 23 | Clyde Tombaugh photographs planet Pluto |
| January 23 | George Washington Birthplace National Monument, Virginia established |
| January 23 | WIS-AM (now WOMG) in Columbia South Carolina begins radio transmissions |
| January 24 | J E Mills scores 117 on Test Cricket debut, New Zealand vs. England, Wellington |
| January 24 | Stewie Dempster scores New Zealand's 1st Test century |
| January 26 | Cleveland's Terminal Tower opens (52 stories) |
| January 30 | Vladimir Mayakovsky's "Banya," premieres in Leningrad |
| January 31 | 1st U.S. glider flight from a dirigible, Lakehurst, NJ |
| February 1 | Arnold Schonbergs opera premieres in Frankfurt |
| February 3 | Vietnamese Communistic Party forms |
| February 3 | William Howard Taft, resigns as chief justice for health reasons |
| February 4 | 1st tieless, soundless, shockless streetcar tracks, New Orleans |
| February 5 | 5th Aliyah to Israel begins |
| February 8 | "Happy Days Are Here Again" by Benny Mereoff hits #1 |
| February 10 | Grain Stabilization Corporation authorized by Congress |
| February 15 | Weona beats Toluca in Illinois Basketball Tournament in 10 overtimes |
| February 17 | French government of Tardieu falls |
| February 18 | Cow flown and milked, milk sealed in paper containers and parachuted |
| February 18 | Luigi Pirandello's "Come Tu Mi Vuoi," premieres in Milan |
| February 18 | Richard Rodgers and Lorenz Hart's "Simple Simon," premieres in New York City |
| February 18 | U.S. astronomer Clyde Tombaugh discovers Pluto |
| February 20 | Capelle soccer team forms |
| February 21 | Marc Connelly's "Green Pastures," premieres in New York City |
| February 25 | Check photographing device patented |
| February 25 | George Headley completes twin tons in Test Cricket vs. England (114 and 112) |
| February 26 | 1st red and green traffic lights installed (Manhattan New York City) |
| February 26 | "Green Pastures" opens at Mansfield Theater |
| February 26 | West Indies make 1st Test Cricket win, by 289 runs over England |
| February 27 | Bouvet Island declared a Norwegian dependency |
| March 2 | 1st U.S. indoor glider flight, St. Louis Terminal Building |
| March 4 | Coolidge Dam in Arizona dedicated |
| March 4 | Emma Fahning bowls 1st sanctioned 300 game by a woman |
| March 6 | Clarence Birdseye develops a method for quick freezing food |
| March 7 | Georgetown High of Chicago defeats Homer 1-0 in basketball |
| March 8 | Babe Ruth signs 2-year contract for $160,000 with New York Yankee General Manager Ed Barrow, wrongly predicts "No one will ever be paid more than Ruth" |
| March 8 | Mahatma Gandhi starts civil disobedience in India |
| March 11 | President and Chief Justice William Taft buried in Arlington |
| March 12 | Mohandas Gandhi begins 200m (300km) march protesting British salt tax |
| March 12 | Stella Walsh sets record for the 220-yard dash (0:26.1) |
| March 13 | Clyde Tombaugh announces discovery of Pluto at Lowell Observatory |
| March 15 | 1st seaplane glider flown, Port Washington, New York |
| March 15 | 1st streamlined submarine of U.S. navy, USS Nautilus, launched |
| March 16 | USS Constitution (Old Ironsides) floated out to become a national shrine |
| March 18 | Boston Bruins win record 20th NHL home game |
| March 19 | Nakagawa Soen accepted as a student of Katsube Keigaku Roshi |
| March 20 | Clessie Cummins sets diesel engine speed record of 129.39 kph |
| March 23 | U.S. Ladies Figure Skating championship won by Maribel Vinson |
| March 23 | U.S. Mens Figure Skating championship won by Roger Turner |
| March 24 | 1st religious services telecast in U.S. (W2XBS New York City) |
| March 24 | Planet Pluto named |
| March 24 | Ronsburgse Boys soccer team forms |
| March 26 | Congress appropriates $50,000 for Inter-American highway |
| March 27 | 1st U.S. radio broadcast from a ship at sea |
| March 28 | 1st performance of Walter Piston's Suite for orchestra (Boston) |
| March 28 | Constantinople and Angora changes names to Istanbul and Ankara |
| March 30 | Babberich-H soccer team forms |
| April 1 | "Blue Angel," starring unknown Marlene Dietrich, premieres in America |
| April 2 | 1st NewYork - Bermuda airplane flight lands in Bermuda |
| April 3 | Ras Tafari becomes Emperor Haile Selassie of Abyssinia (Ethiopia) |
| April 3 | Stanley Cup: Montreal Canadiens sweep Boston Bruins in 2 games |
| April 4 | Andrew Sandham makes Test Cricket 1st triple century |
| April 4 | Les Ames makes the 1st Test Cricket century by a wicketkeeper (149) |
| April 5 | England out for 849 vs. WI Kingston, Sandham out for 325 |
| April 6 | 1st transcontinental glider tow completed |
| April 6 | Hostess Twinkies invented by bakery executive James Dewar |
| April 10 | George Headley scores 223 vs. England at Kingston |
| April 10 | Synthetic rubber 1st produced |
| April 12 | 4th Test Cricket WI vs. England ends in a draw after nine days |
| April 12 | Wilfred Rhodes ends Test Cricket career aged 52 years 165 days |
| April 14 | Philip Barry's "Hotel Universe," premieres in New York City |
| April 17 | Abkhazian ASSR forms in Georgian SSR |
| April 19 | 34th Boston Marathon won by Clarence DeMar of Mass in 2:34:48.2 |
| April 21 | Fire at Ohio State Penitentiary kills 322 |
| April 21 | Vladimir Mayakovsky's "Moskva Golid," premieres in Moscow |
| April 22 | U.S., Britain and Japan sign London Naval Treaty |
| April 28 | 1st night organized baseball game Independence. Kansas |
| April 29 | 123 runs are scored in 7 major league games |
| April 29 | North Sea floodgate at Ijmuiden (biggest in world) officially opens |
| April 29 | Telephone connection England-Australia goes into service |
| May 1 | Bradman scores 236 Australia vs. Worcs, his 1st f-class innings in Eng |
| May 2 | Des Moines (Western League) defeats Wichita 13-6 to open 1st ballpark with permanently installed lights |
| May 5 | 1st woman to fly solo from England to Australia takes-off (Amy Johnson) |
| May 5 | Bradman scores 185* Australia vs. Leicestershire, 317 minutes, 16 fours |
| May 7 | Duleepsinhji scores 333 for Sussex vs. Northants in 330 minutes |
| May 9 | 56th Preakness: Earl Sande aboard Gallant Fox wins in 2:00.6 |
| May 10 | Adler Planetarium, 1st U.S. planetarium, opens in Chicago |
| May 10 | Clarrie Grimmett takes 10 for 37 vs. Yorkshire at Sheffield |
| May 12 | Pulitzer prize awarded to Marc Connelly (Green Pastures) |
| May 13 | Farmer killed by hail in Lubbock, Texas, only known fatality due to hail |
| May 15 | Ellen Church becomes 1st airline stewardess, United (San Francisco to Cheyenne) |
| May 16 | 6th Walker Cup: U.S., 10-2 |
| May 17 | 56th Kentucky Derby: Earl Sande aboard Gallant Fox wins in 2:07.6 |
| May 19 | White woman win voting rights in South Africa |
| May 20 | 1st airplane catapulted from a dirigible, Charles Nicholson, pilot |
| May 20 | University of California dedicates $1,500 to research on prevention and cure of athlete's foot |
| May 21 | Max Bishop draws 8 walks in a doubleheader |
| May 21 | New York Yankee Babe Ruth hits 3 consecutive homers |
| May 22 | Ruth hits 3 consecutive home run (8th-10th of 60 in 1930) |
| May 22 | Yankee "Bronx Bombers" hit 14 home runs in a game |
| May 24 | 1st woman to fly from England to Australia solo, lands (Amy Johnson) |
| May 24 | Bradman scores 252* Australia vs. Surrey, 290 minutes, 29 fours |
| May 24 | Ruth homers in both games of a doubleheader, giving him 9 in one week |
| May 26 | Joe Sewell, strikes out twice of his 3 times in 1930, by Pat Caraway |
| May 26 | Supreme Court rules buying liquor does not violate the Constitution |
| May 27 | Richard Drew invents masking tape |
| May 28 | Georges Forbes succeeds Joseph Ward as premier of New Zealand |
| May 30 | Bill Arnold wins Indianapolis 500 car race (161.6 kph) |
| May 31 | Bradman gets his 1,000th run of the English Cricket season |
| May 31 | Building begins on Albert Canal in Belgium |
| May 31 | Comet 73P/1930 (Schwassmann-Wachmann 3) approaches 0.0617 AUs of Earth |
| June 1 | 6th French Mens Tennis: Henri Cochet beats Bill Tilden (36 86 63 61) |
| June 1 | 6th French Womens Tennis: Helen Moody beats Helen Jacobs (62 61) |
| June 1 | Alphense Boys soccer team forms in Alphen on Rhine |
| June 1 | Bradman scores cricket 191 Australia vs. Hampshire, 240 minutes, 26 fours |
| June 2 | Sarah Dickson becomes 1st woman Presbyterian elder in U.S., Cincinnati |
| June 7 | 62nd Belmont: Earl Sande aboard Gallant Fox wins in 2:31.6 |
| June 9 | Paavo Nurmi runs world record 6 mile, 29:36.4 |
| June 10 | Winnipeg Rugby Football Club forms |
| June 12 | 34th U.S. Golf Open: Bobby Jones shoots a 287 at Interlachen CC Minnesota |
| June 12 | Heavyweight Max Schmeling KOs Jack Sharkey in New York City |
| June 12 | Max Schmeling beats Jack Sharkey on a foul in 4 for hw boxing title |
| June 13 | 22 people killed by hailstones in Siatista, Greece |
| June 14 | VVGZ soccer team forms in Zwijndrecht |
| June 17 | Bradman scores 131 in the 1st Test cricket at Trent Bridge |
| June 17 | Chuck Klein sets Phillies hitting streak at 26 straight games |
| June 20 | 65th British Golf Open: Bobby Jones shoots a 291 at Hoylake Hoylake |
| June 21 | Ruth hits 3 home runs as Yankees blow 6-0 lead in 7th and lose 15-7 |
| June 22 | Lou Gehrig hits 3 home runs in a game, Ruth hits 3 in doubleheader |
| June 23 | Chicago Cubs beat Philadelphia Phillies 21-8 |
| June 24 | 1st radar detection of planes, Anacostia DC |
| June 24 | Ground is broken for construction of Cleveland Stadium |
| June 30 | 1st round-the-world radio broadcast Schenectady NY |
| June 30 | Bradman scores 254 at Lord's vs. England, 320 minutes, 25 fours |
| July 1 | Great Britain signs accord for Independence of Iraq |
| July 3 | Veterans Administration created |
| July 4 | 43rd Wimbledon Womens Tennis: Helen Moody beats Elizabeth Ryan (62 62) |
| July 5 | 50th Wimbledon Mens Tennis: Bill Tilden beats W Allison (63 97 64) |
| July 7 | Construction begins on Boulder Dam |
| July 11 | Bradman scores 309 in a day vs England at Leeds, goes on to 334 |
| July 12 | 34th U.S. Golf Open: Robert T "Bobby" Jones wins |
| July 12 | Bradman out for 334 in Test Cricket at Headingley, 383 minutes, 46 fours |
| July 12 | Hedley Verity takes 10 for 10 vs. Notts (19 4-16-10-10) at Leeds |
| July 13 | 1st-ever soccer World Cup competition began in Uruguay |
| July 13 | Sarnoff reports in New York Times "TV would be a theater in every home" |
| July 18 | SHO soccer team forms in Old Beijerland |
| July 20 | 106 degrees F (41 degrees C), Washington, D.C. (district record) |
| July 21 | 110 degrees F (43 degrees C) at Millsboro, Delaware (state record) |
| July 21 | U.S. Veterans Administration forms |
| July 23 | Earthquake strikes Ariano Italy, 1,500 killed |
| July 23 | Pitts Pie Traynor ends both games with home runs (1st in 9th, 2nd in 13th) |
| July 25 | Philadelphia Athletics triple steal in 1st and 4th innings vs Cleveland |
| July 27 | Andre Leducq wins Tour de France |
| July 28 | 114 degrees F (46 degrees C), Greensburg, Kentucky (state record) |
| July 29 | 115 degrees F (46 degrees C), Holly Springs, Mississippi (state record) |
| July 29 | Airship R100, 1st passenger-carrying flight from England to Canada |
| July 30 | 1st broadcast of "Death Valley Days" on NBC-radio |
| July 30 | Uruguay beats Argentina 4-2 for soccer's 1st World Cup in Montevideo |
| July 31 | Lou Gehrig grand slams as Yankees beat Red Sox 14-13 |
| August 3 | 2nd time in 1930, Chuck Klein of Phillies hits in 26 straight games |
| August 4 | Child labor laws established in Belgium |
| August 6 | Remains of Solomon Andrees' balloon expedition to North Pole in 1897, found at Kvit oya Spitsbergen |
| August 6 | Supreme Court Justice John Force Crater disappears in New York City |
| August 7 | Richard Bedford Bennet forms Canadian government |
| August 8 | St. Louis Cardinals are 12 games back in NL, and go on to win pennant |
| August 9 | 113 degrees F (45 degrees C) at Perryville, Tennessee (state record) |
| August 9 | Betty Boop debuts in Max Fleischer's animated cartoon Dizzy Dishes |
| August 9 | Percy Williams runs world record 100m (10.3 sec) |
| August 18 | Eastern Airlines begins passenger service |
| August 20 | Bradman scores 232 in 5th Test Cricket at The Oval |
| August 20 | Dumont's 1st TV broadcast for home reception (New York City) |
| August 21 | Prohibition of Wieringermeer finished |
| August 22 | Australia regain Ashes on 6th day of 5th Cricket Test |
| August 23 | 44th U.S. Womens Tennis: Betty Nuthall beats Anna McCune Harper (61 64) |
| August 26 | Hack Wilson hits his 44th home run, breaks Chuck Klein's NL record |
| September 1 | NY World reports disappearance of supreme court justice Joseph Crater |
| September 2 | 1st non-stop airplane flight from Europe to U.S. (37 hours) |
| September 3 | Hurricane kills 2,000, injures 4,000 (Dominican Republic) |
| September 4 | Cambridge Theater opens in London |
| September 6 | Brooklyn Dodgers beat Phillies 22-8 |
| September 8 | 1st appearance of comic strip "Blondie" |
| September 8 | New York City public schools begin teaching Hebrew |
| September 8 | Richard Drew creates Scotch tape |
| September 10 | Charles E Mitchell, named minister to Liberia |
| September 11 | Stomboli volcano (Sicily) throws 2-ton basaltic rocks 2 miles |
| September 12 | Brooklyn catcher Al Lopez hits major league's last recorded bounce home run |
| September 13 | 50th U.S. Mens Tennis: J H Doeg beats Francis Shields (10-8 16 64 16-14) |
| September 13 | Paavo Nurmi runs world record 20,000m (1:04:38.4) |
| September 13 | Tommy Armour wins PGA golf tournament |
| September 13 | Winnipeg Rugby Football Club 1st game, loses to St. John's Rugby, 7-3 |
| September 14 | Detroit Lions (as Portsmouth Spartans) play 1st NFL game, win 13-6 |
| September 14 | Nazis gain 107 seats in German election |
| September 15 | 1st International bridge match is held in London. U.S. team defeats England |
| September 16 | Phillies trailing 10-5, score 5 in 9th, then Pirates score 4 in top of 10th, so Phillies score 5 in bottom of 10th to win 15-14 |
| September 18 | Enterprise (U.S.) beats Shamrock V (England) in 15th America's Cup |
| September 18 | New York Yankee pitcher Red Ruffing hits 2 home runs to beat St. Louis Browns, 7-6 |
| September 18 | Philadelphia A's win AL championship for 2nd year in a row |
| September 21 | Johann Ostermeyer patents flashbulb |
| September 24 | G Kaufman and M Hart's "Once in a Lifetime," premieres in NY |
| September 24 | Noel Coward's "Private Lives," premieres in London |
| September 24 | Portsmouth beats Brooklyn in 1st NFL game played under floodlights |
| September 25 | Austrian government of Vaugoin forms |
| September 25 | Roger Hornsby replaces Joe McCarthy as Cubs manager |
| September 25 | Zoe Akins' "Greeks Had a Word for it," premieres in New York City |
| September 27 | 34th U.S. Golf Amateur Championship won by Bobby Jones |
| September 27 | Cub's Hack Wilson's 2 home runs give him NL record 56 home runs |
| September 27 | White Sox 1st baseman Bud Clancy didn't handle ball at all in a 9 inning game vs St. Louis Browns |
| September 28 | Lou Gehrig's errorless streak ends at 885 consecutive games |
| September 29 | 1st Canadian football game played under lights, Hamilton-UBC |
| September 29 | Bing Crosby marries Dixie Lee |
| September 29 | Boqueron battle ends Paraguay border dispute |
| September 29 | Lowell Thomas made debuts on CBS Radio replacing Floyd Gibbons |
| September 29 | New York City College offers 1st course in radio advertising |
| October 1 | Soccer team WHC forms |
| October 1 | World Series opens at Phila's Shibe Park, Philadelphia A's beat St. Louis 5-2 |
| October 4 | A's Jack Quinn, 46, pitches 2 inn, is oldest to play in World Series |
| October 5 | British airship crashes in storm at Beauvais France, 48 die |
| October 8 | Philadelphia A's beat St. Louis Cardinals, 4 games to 2 in 27th World Series |
| October 9 | 1st transcontinental flight by a woman completed, Laura Ingalls |
| October 10 | AP votes Joe Cronin unofficial AL MVP and BWA names Hack Wilson NL MVP |
| October 10 | Yankees announce signing Joe McCarthy to manage for 4 years |
| October 13 | New German Reichstag opens with 107 NSDAP'ers in uniform |
| October 14 | Ethel Mermans debuts on Broadway in "Girl Crazy" |
| October 14 | George Gershwin/Walter Donaldsons musical premieres in New York City |
| October 18 | Joseph Sylvester becomes 1st jockey to win 7 races in 1 day |
| October 19 | Jules Ladoumegue runs world record 1 km (2:23.6) |
| October 20 | Adventures of Sherlock Holmes, premiers on NBC radio |
| October 20 | British White Paper restricts Jews from buying Arab land |
| October 22 | 1st concerto of BBC Symphony Orchestra, under Adrian Boult |
| October 22 | Blake and Razaf's "Lew Leslie's Blackbirds of 1930," premieres in New York City |
| October 22 | South Carolina Genemuiden soccer team forms |
| October 25 | 1st football game in Atlantic City Convention Center |
| October 25 | 1st scheduled transcontinental air service began |
| October 26 | Dmitri Sjostakovitch' ballet "Zolotoy Vyek," premieres in Leningrad |
| October 29 | 1st Eastern Canada night CF game: Oshawa vs Toronto Balmy Beach |
| October 30 | Turkey and Greece sign a treaty of friendship |
| November 2 | Ras Tafari crowned Haile Selassie I, 225th emperor of Solmonic Dynasty |
| November 3 | 1st vehicular tunnel to a foreign country, Detroit - Windsor, opens |
| November 3 | Bank of Italy becomes Bank of America |
| November 5 | Nobel for literature awarded to Sinclair Lewis for "Babbitt" |
| November 8 | Friedrich Wolf's "Die Matrosen von Cattaro," premieres in Berlin |
| November 9 | 1st nonstop airplane flight from New York to Panama |
| November 13 | WA Drake's "Grand Hotel," premieres in New York City |
| November 17 | Musical "Sweet and Low" with Fanny Brice premieres in New York City |
| November 18 | Musical "Smiles" with Bob Hope/Fred Astaire premieres in New York City |
| November 18 | Sjostakovitch' opera "The Nose," premiers in Lenningrad |
| November 22 | 1st Irish Sweepstake run |
| November 22 | 1st U.S. football game broadcast to England (Harvard 13, Yale 0) |
| November 22 | Elijah Muhammad forms Nation of Islam in Detroit |
| November 23 | New York Giant Hap Moran runs 91 yards for a TD from a scrimmage |
| November 24 | 1st woman pilot on a transcontinental air flight Miss Ruth Nichols (Mineola, New York to California), in a Lockheed-Vega, took 7 days |
| November 25 | 690 earthquake shocks recorded in 1 day (Ito Japan) |
| November 25 | Sporting News picks Bill Terry as NL MVP and Joe Cronin as AL MVP |
| November 28 | Howard Hanson's 2nd Symphony "Romantic," premieres |
| December 1 | NHL drops 20 minute slashing-about-the-head penalty |
| December 1 | Ruth Nichols becomes 1st woman pilot to cross continent |
| December 3 | Air-borne chemicals combine with fog to kill 60 (Meuse Valley Belgium) |
| December 3 | Otto Ender forms Austrian government |
| December 3 | Richard Rodgers and Lorenz Hart's musical "Evergreen," premieres in London |
| December 4 | French government of Tardieu falls |
| December 4 | Vatican approves rhythm method for birth control |
| December 6 | 18th CFL Grey Cup: Toronto Balmy Beach defeat Regina Roughriders, 11-6 |
| December 6 | Pablo Neruda marries Marie A Hagenaar Vogelzang in Batavia |
| December 7 | 13th PGA Championship: Tommy Armour at Fresh Meadows CC Flushing |
| December 8 | Broadway Theater opens at 1681 Broadway New York City |
| December 8 | Cole Porter's musical "NYCers," premieres in New York City |
| December 11 | Bank of the United States opens in New York City |
| December 12 | Baseball changes rule, ball bounces into stands not a home run, now a double |
| December 12 | Baseball Rules Committee greatly revises the rule book |
| December 12 | Start of the 1st Australia vs. West Indies Test (at Adelaide) |
| December 13 | George Sisler's career ends when Boston Braves release him |
| December 13 | Theodore Steeg forms French government |
| December 14 | New York Giants defeat Notre Dame 22-0 in a charity game |
| December 15 | Don Bradman takes his 1st Test Cricket wicket (Ivan Barrow, WI, lbw) |
| December 16 | Golfer Bobby Jones wins James E Sullivan Award |
| December 18 | Bradman scores 258 NSW vs. South Australia, 289 minutes, 37 fours |
| December 19 | James Weldon Johnson resigns as executive secretary of NAACP |
| December 20 | Learie Constantine cricket 100 in 52 minutes WI vs. Tas (10x4, 1x6, 1x5) |
| December 22 | 6 West europe lands signs Convention of Oslo |
| December 23 | Bette Davis arrives in Hollywood under contract to Universal Studios |
| December 23 | Police Bureau of Criminal Alien Investigation started in New York City |
| December 24 | Bandung, Java: ir Sukarno 4 years jail sentenced |
| December 24 | F Garcia Lorca's "La Zapatera Prodigiosa," premieres in Madrid |
| December 25 | Mount Van Hoevenberg bobsled run at Lake Placid, New York opens |
| December 25 | Slinger Nitschke scores 142 SA vs. Qld at Adelaide before 5,422 |
| December 25 | Tasmania all out 280, WI 2-139 at Hobart Crowd 2,500 |
| December 29 | Fred P Newton completes longest swim ever (1826 miles), when he swam in the Mississippi River from Ford Dam, Minn, to New Orleans |
| December 31 | Pontifical encyclical Casti connubii against mixed marriages |
| December 31 | U.S. tobacco industry produced 123 billion cigarettes in 1930 |
