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The assassination of Austrian Archduke Franz Ferdinand is the main event that led to the start of WWI. -
The first step of ending the WWI was the Armistice document between Germany and the Allies. -
Adolf Hitler's invasion of Poland led to Great Britain declaring war on Germany. This started WWII -
The Japanese surrendered after the atomic bomb was dropped on Hiroshima and Nagasaki. The Japanese representative signed a document on the deck of battleship USS Missouri. -
The differences in beliefs and rivalry between the United States and the USSR started the cold war. -
There was tension between the Korean peninsula. It wasn't till the North Korean army invaded and attacked South Korea that the Korean War started. -
An armistice was signed agreeing that Korea would remain a divided country. It was signed by the U.S., the People's Republic of China, North and South Korea. -
Allegedly there were unprovoked attacks on two U.S destroyers by North Vietnamese torpedo boats. This gave the U.S president authority to wage war. -
North forces ended the war by seizing control of South Vietnam. -
The end of the Cold War came because the Soviet Union collapsed.