Question

which incident brought USA in the second world war

Answer 1

The cause of the “Official” entry of the United States into World War II was the attack on Pearl Harbor, Hawaii. However, the U. S. was “unofficially” quite involved in the war already, since 1939, even somewhat previously if you count the Panay Incident in support of China in 1937.

Answer 2

The entry of the USA into the war .The amrrican congress decided to lend or lease armanents to Britain and China ,because their defence of US.The only military force that Japan had to fear was the US pacific Fleet based at Pearl Habour in Hawaii.