Nazi Germany attacked and invaded Poland. This invasion what what made the Allies declare war on Germany and marked the beginning of World War II.
Attack on Pearl Harbor
December 7, 1941
The Attack on Pearl Harbor was a surprise military attack on Hawaii by the Imperial Japanese Air Service, in order to prevent the United States from interfering with its planned military actions in Southeast Asia. The United States would formally enter World War II the next day.
Battle of Midway
June 4, 1942 - June 7, 1942
A decisive battle between the United States Navy and the Imperial Japanese Navy 6 months after Japan's attack on Pearl Harbor. The United States Navy won this battle, causing Japan to abandon its plan to expand its reach further into the Pacific, and stayed defensive for the rest of the war.
Battle of Stalingrad
August 23, 1942 - February 2, 1943
The largest confrontation in World War II. Germany and their allies fought against the Soviet Union in Southern Russia for control of the city of Stalingrad.
June 6, 1944
When the Allies invaded Normandy by landing on its beaches. This was one of the largest seaborne invasions in history, starting the Battle of Normandy, which would result in the liberation Western Europe from Germany's control.
May 8, 1945
Victory in Europe Day, or V-E Day, celebrates the day that Germany's surrender was accepted.
The Bombing of Hiroshima and Nagasaki
August 6, 1945 - August 9, 1945
The United States detonated 2 nuclear bombs over the Japanese cities of Hiroshima and Nagasaki. This event lead to Japan's surrender in World War II.
August 15, 1945
Victory over Japan Day, or V-J Day, celebrates the day Imperial Japan surrendered during World War II. This surrender brought World War II to an end.