Age of Catastrophes By moneim143 Oct 24, 1924 Stock market crash begins Oct 29, 1929 'Black Tuesday'. U.S. Stock market collapse. Sep 21, 1931 Britain goes off the gold standard. Apr 5, 1933 U.S. President Franklin D. Roosevelt "forbidding the Hoarding of Gold Coin Dec 6, 1941 Roosevelt authorizes the Manhattan Project Dec 7, 1941 Attack on Pearl Harbor Jul 16, 1945 Fist Atomic Bomb Dropped Jul 21, 1945 President Truman Orders for bombs to be used Aug 6, 1945 Little Boy was dropped Aug 9, 1945 Fat Man was dropped Nov 1, 1952 First Hydrogen Bomb was dropped