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WW2 started due to unresolved issues from ww2. The treaty of Versailles left germany resentful. Economic depression hit many countries hard. Adolf Hitler rise to power fueled aggression. his invasion of Poland in 1939 triggered the war.

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The U.S. joined WW2 after Japan attack pearl harbor. this happened December 7, 1941. that attack led to direct military threat. The U.S. declared was on Japan . germany and Italy then declared it was on the U.S.

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on June 6, 1944, known as D-Day, allied forces invaded Normandy, France in a massive operation called d-day. over 156,000 troops landed on five beachheads, facing strong German resistance. despite heavy casualties, the allies secured the beaches. this event marked the beginning of the end of Nazi control in western Europe

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The Pacific war was brutal with fierce island battles and harsh jungle fighting. heavy casualties occurred on both sides. navel and air engagements were significant. kamikaze attacks intensified the conflict. the war ended with atomic bombing.

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world War 2 ended due to serval key events. the Yalta conference in february 1945 set the stage for post war Europe. VE Day on may 8, 1945, marked the allied victory in Europe. The atomic bombings of Hiroshima and Nagasaki in august 1945 led to Japan's surrender. these events collectively brought the war to an end.