4. The Japanese Attack on Pearl Harbor (1941)
On December 7, 1941, the United States was jolted awake as Japanese forces launched a surprise attack on Pearl Harbor. This devastating strike destroyed much of the U.S. Pacific Fleet and instantly propelled the nation into World War II. The attack’s immediate effect on global alliances was profound, uniting allies against the Axis powers overnight. According to the National WWII Museum, it was a pivotal moment that forever changed the course of history.
