August 10, 1920: Release of Mamie Smith's record "Crazy Blues" opens the "Jazz Age"August 26, 1920: National Women's Party leader Alice Paul marks proclamation of the 19th AmendmentAugust 20, 1920: 8MK, the first U.S. radio station, goes on the airAugust 15, 1920: Poland's Army turns back the Soviet Russian invasion