The attack on Pearl Harbor on December 7, 1941, changed everything for the United States in World War II.

Before this event, the U.S. wanted to stay out of conflicts. They were focused on keeping to themselves because of the bad memories from World War I and the tough times during the Great Depression.

But after Japan’s surprise attack, which destroyed many battleships and took the lives of over 2,400 Americans, people quickly changed their minds about getting involved in the war.

Important Effects of the Attack:

1. Declaration of War:

   • The very next day, President Franklin D. Roosevelt spoke to Congress. He called December 7 "a day that will live in infamy." Shortly after, Congress voted to go to war against Japan. This meant the U.S. was officially part of World War II.

2. Joining Forces:

   • After the U.S. declared war on Japan, Germany and Italy also declared war on America. This brought the U.S. closer to its Allies, who were fighting against the Axis Powers.

3. Using Resources:

   • The attack led to a huge effort to get military and industrial resources ready for war. Factories switched from making regular products to war supplies. This created many jobs and helped improve the economy.

In summary, Pearl Harbor changed the U.S. from a country that wanted to stay neutral to one that actively fought in World War II. This shift set the stage for major battles in both Europe and the Pacific.