Step 1 : Introduction to the question "1. The USA entered World War II on 7th December 1941. What was the immediate reason?"
...1. Germany again sank American ships 2. Japan invaded Alaska 3. Germany declared war on America 4. Japanese attack on Pearl Harbor The Japanese launched an unprovoked attack on Pearl Harbor, Hawaii in December 1941. America entered WWII a day later after declaring war on Japan. Soon afterwards Germany and Italy declared war on America in support of Japan.
