Question
Which event directly led to America's formal entry into World War II?
The invasion of Poland
The attack on Pearl Harbor
The fall of France
The Battle of Britain
The invasion of Poland
The attack on Pearl Harbor
The fall of France
The Battle of Britain
Answers
GPT-4o mini
The event that directly led to America's formal entry into World War II was the attack on Pearl Harbor. This surprise military strike by the Japanese Navy on December 7, 1941, prompted the United States to declare war on Japan the following day, marking its entry into the conflict.