The event sparked US entry into World War II in 1941?

• A. The Battle of Britain
• B. The invasion of Poland
• C. The Japanese attack on Pearl Harbor
• D. The bombing of Hiroshima

Answer: (C)

The event that brought the United States into World War II in 1941 was the Japanese attack on Pearl Harbor. On December 7, 1941, Japan launched a surprise strike against the U.S. naval base at Pearl Harbor in Hawaii, aiming to cripple the American fleet and hinder U.S. actions in the Pacific. In response, the United States declared war on Japan the next day, and shortly after Germany and Italy declared war on the United States, pulling the nation fully into the conflict on both the Pacific and European fronts. The other options occurred earlier or later and did not directly trigger U.S. entry in 1941: the Battle of Britain was a 1940 air campaign that Britain withstood without U.S. entry; the invasion of Poland in 1939 started WWII but the U.S. remained neutral at that time; the bombing of Hiroshima happened in 1945 after the war in Europe had ended.