"World war 2:the revolution of conflict"

World War II (1939–1945) was a global conflict that involved most of the world's nations, including the great powers, which eventually formed two opposing military alliances: the Allies, led primarily by the United States, the Soviet Union, and the United Kingdom, and the Axis powers, led by Nazi Germany, Imperial Japan, and Fascist Italy. The war began with Germany's invasion of Poland, prompting Britain and France to declare war. It was marked by significant events such as the Holocaust, the Battle of Stalingrad, D-Day, and the atomic bombings of Hiroshima and Nagasaki. The war reshaped the global political landscape, leading to the Cold War, the formation of the United Nations, and the decolonization of many countries. It resulted in an estimated 70 million deaths, making it the deadliest conflict in human history.