What happend in world war 2?

World War II (often abbreviated as WWII or WW2), also known as the Second World War, was a global war that lasted from 1939 to 1945, involving the vast majority of the world's countries—including all of the great powers—eventually forming two opposing military alliances: the Allies and the Axis. It was the most widespread war in history, with more than 100 million people mobilized in more than 30 countries. The major participants were the United States, the Soviet Union, China, and the United Kingdom. These four powers are collectively referred to as the Big Four or Grand Alliance.

The war had a profound impact on the course of the 20th century. The Axis powers were eventually defeated, and the war ended with the unconditional surrender of Japan on September 2, 1945. The war resulted in an estimated 70 to 85 million fatalities. These made World War II the deadliest conflict in human history.

The immediate cause of the war was the invasion of Poland by Germany in September 1939. The invasion was followed by a series of further German conquests, including the annexation of Austria and Czechoslovakia. In response, the United Kingdom and France declared war on Germany. The Soviet Union also invaded Poland from the east, and divided the country with Germany.

The war soon spread to other parts of Europe, including the invasion of the Netherlands, Belgium, and Luxembourg by Germany. The Germans also invaded Denmark and Norway. In June 1940, France fell to Germany, and the British Expeditionary Force was evacuated from Dunkirk.

In the summer of 1940, the Battle of Britain began. The German air force, the Luftwaffe, attempted to gain air superiority over the United Kingdom in preparation for an invasion. However, the Royal Air Force (RAF) defeated the Luftwaffe, and the invasion was postponed indefinitely.

In the meantime, the war had also spread to North Africa and the Middle East. In 1941, Germany invaded Yugoslavia and Greece, and also launched Operation Barbarossa, the invasion of the Soviet Union. The German advance into the Soviet Union was initially successful, but the Soviets were able to stop the Germans at the Battle of Stalingrad in 1942-1943.

In 1941, Japan also entered the war. Japan attacked the United States at Pearl Harbor, Hawaii, on December 7, 1941. The attack on Pearl Harbor led the United States to enter the war on the side of the Allies.

The war in the Pacific was marked by a series of island-hopping campaigns by the United States and its allies. The Americans gradually advanced towards Japan, capturing key islands along the way. In August 1945, the United States dropped atomic bombs on the Japanese cities of Hiroshima and Nagasaki. The bombings resulted in the surrender of Japan and the end of the war.

The war had a profound impact on the world. The war led to the deaths of millions of people, and the destruction of cities and infrastructure. The war also had a major impact on the political landscape of the world. The Soviet Union emerged from the war as a superpower, and the United States became the dominant economic and military power in the world.

The war also led to the creation of the United Nations, an international organization dedicated to maintaining peace and security in the world. The United Nations has played a major role in preventing future wars and promoting cooperation between nations.

The war had a lasting impact on the world, and its legacy continues to shape the way we live today.