FTCE Social Science Practice Test 2025 - Free Florida Teacher Certification Exam Practice Questions and Study Guide

The immediate cause for the United States' entry into World War II was Japan's attack on the US naval base at Pearl Harbor on December 7, 1941. This surprise military strike led to significant loss of life and damage to the Pacific Fleet and galvanized public opinion in the United States towards joining the war. The attack directly prompted President Franklin D. Roosevelt to ask Congress for a declaration of war against Japan, which was granted the following day.

The events surrounding this attack are crucial in understanding the broader context of World War II, as they marked a pivotal shift from a policy of neutrality to active involvement in the conflict for the United States.

While other options reference events related to the war, such as the sinking of American supply ships by Nazi Germany or declarations of war by Italy and Germany, these occurred after Pearl Harbor and were not immediate catalysts for entry. Additionally, the assassination of the Archduke of Austria is tied to the events leading to World War I, making it irrelevant in this context. Overall, the attack on Pearl Harbor stands as the definitive trigger that led the United States to formally engage in World War II.