Which incident persuaded the USA to hitch the war?

Japan’s attack on the United States of America base at Pearl Harbour

In December 1941, Japan launched a surprise attack on the United States' naval base at Pearl Harbor in Hawaii. This incident shocked the United States and played a crucial role in persuading the USA to join World War II. Prior to this, the USA had been neutral, but the unprovoked attack led to significant military losses and loss of life, making it clear that the country could no longer remain outside the conflict. The attack on Pearl Harbor directly led to the U.S. declaring war on Japan, and subsequently on Germany and Italy, marking the USA's full entry into the war.

The attack was a pivotal moment in history, as it not only prompted the USA to join the war but also marked a turning point in the global power dynamics of the time.