Event:
Certain members of Greece's Syriza party form the Popular Unity Party, which opposes the current E.U. bailout; Prime Minister Alexis Tsipras, who ran on a Syriza anti-bailout platform, resigned after accepting the bailout terms against voter wishes
More Notable Events on August 21:
1993 NASA loses contact with Mars Observer
1989 Voyager 2 begins a flyby of planet Neptune
1968 Democratic Convention opens in Chicago
1968 Warsaw Pact forces enter Czechoslovakia to end reform movement
1897 Oldsmobile begins operation as a General Motors Corp division
