July 30, 1975 – Former Teamsters Union leader James “Jimmy” Hoffa is last seen outside a restaurant in Detroit, Michigan. He is declared officially dead in 1982.
July 31, 1790 – The U. S. Patent Office opens and issues the first patent to Samuel Hopkins for a new method of making potash (fertilizer). The patent is signed by George Washington and Thomas Jefferson.
August 2, 1923 – President Warren G. Harding dies suddenly in San Francisco while on a Western speaking tour. The following day Calvin Coolidge is sworn into office. Harding’s legacy is tainted by the Teapot Dome oil lease scandal that comes to light following his death.
August 4, 1964 – “Freedom Summer” Civil Rights workers James Chaney, Andrew Goodman, and Michael Schwerner are found murdered and buried in an earthen dam outside Philadelphia, Mississippi. They were participating in efforts to increase Black voter registration. Seven avowed members of the Ku Klux Klan are convicted on federal conspiracy charges in connection with the deaths.