The 1940s was a decade marked by significant global events, primarily shaped by World War II, which lasted from 1939 to 1945. This conflict involved many nations, including the major powers of the Allies and the Axis. The war led to widespread destruction and significant changes in political boundaries and power dynamics around the world. After the war, the 1940s saw the beginning of the Cold War, a period of tension between the United States and the Soviet Union. The decade also witnessed the establishment of the United Nations in 1945, aimed at promoting international cooperation and preventing future conflicts. Social changes, including movements for civil rights, began to gain momentum during this time.