V-J Day, celebrated every September 2 in the United State. VJ stands for Victory over Japan Day. It commemorates a shift in the Second World War in favor of the Allies (the U.S., Great Britain, France and other nations) that spelled the end of the massive conflict.
It is commonly accepted knowledge that what precipitated the Japanese Empire’s ultimate surrender was the U.S. having bombed two major Japanese cities (Nagasaki and Hiroshima) with atomic warheads, causing such a concentrated and gigantic loss of Japanese lives that there really was no hope of a victory for the island nation thereafter.