The REALLY big thing that happened May 7:
May 7, 1945 2:41 a.m. at Supreme Headquarters Allied Expeditionary Force in Rheims, France, German general Alfred Jodl signs the unconditional surrender of all German forces one week after Adolf Hitler commits suicide in his Berlin Bunker.
It appears May 7 was very significant multiple times since it also includes the Vietnamese defeating the French at Dien Bien Phu, causing the French to leave their colony to the natives. Both surrenders, German and French, figured greatly into US history in the final half of the 20th Century.
1945: At 2:41 a.m. at Supreme Headquarters Allied Expeditionary Force in Rheims, France, German general Alfred Jodl signs the unconditional surrender of all German forces one week after Adolf Hitler commits suicide in his Berlin Bunker.
Except Hitler did not commit suicide, that has been proven along with contemporary accounts that US and Russians knew it was a lie.