Because of Germany invading Poland, Britain and France declare war on Germany.
Germany invades Poland and starts WW11
Russia was invaded by Germany so they entered the war.
Because of Japan's attack on Pearl Harbor, the US entered WW11.
The Allies defeat Japan in the Battle of Midway.
When Italy surrendered, they left the war.
D-day: Allied troops land in France and begin invasion.
When Germany surrendered, it ended WW11 in Europe
The US dropped atomic bombs on Hiroshima and Nagasaki.
Japan signs surrender agreement, ending war.