What happened in the year of 1939 - 1945?

From 1939 to 1945, World War II occurred, a global conflict involving most of the world's nations. It began with Germany's invasion of Poland in September 1939 and saw the Axis powers, including Germany, Italy, and Japan, fighting against the Allies, which included the United States, the Soviet Union, and the United Kingdom. The war resulted in significant loss of life, widespread destruction, and major events such as the Holocaust and the use of atomic bombs on Hiroshima and Nagasaki. It ended with the unconditional surrender of Germany in May 1945 and Japan in September 1945.