Event:
Barack Obama becomes the first U.S. president to address the African Union, which includes 54 nations as members; the president emphasized the importance of growing economies, reducing corruption, increasing education, and instituting democracy
More Notable Events on July 28:
1945 Airplane crashes into the Empire State Building
1926 U.S. and Panamanian pact about safeguard of Panama Canal
1900 Hamburger created by Louis Lassing in Connecticut
1866 Metric system becomes a legal measurement system in U.S.
1858 Nadar takes 1st airborne photo, in a balloon
