History · 2
Which Japanese military action triggered U.S. entry into World War II?
Answer
Attack on Pearl Harbor
The Japanese attack on Pearl Harbor on December 7, 1941, killed over 1,100 Americans and destroyed numerous warships and aircraft, prompting the United States to declare war on Japan the following day. This surprise military assault on the American naval base in Hawaii galvanized American public opinion for war and brought the United States into World War II. President Franklin Roosevelt called December 7 'a date which will live in infamy,' and the attack unified Americans behind the war effort against Japan and the Axis powers.
💡 Did you know?
The USS Arizona battleship sank during the Pearl Harbor attack with 1,102 sailors aboard, and oil from the wreck continues to leak from the ocean floor.
Other options people guess
- Attack on Midway
- Invasion of Manchuria
- Invasion of the Philippines
Topics
- world-war-2
- american-history
Know your history trivia?
Play a free History quiz and see how many you get right — no signup needed to start.
More History facts
History
What treaty ended World War II in Europe?
Potsdam was signed by Stalin, Truman (replacing Roosevelt after his death), and Churchill, then replaced by Clement Attlee mid-conference.
History
Who was the British Prime Minister during most of World War II?
Churchill is remembered for his defiant speeches and famous phrases like 'We shall never surrender' that sustained British morale.
History
Which American explorers led the famous expedition to map the Louisiana Territory from 1804-1806?
The expedition identified 178 plants and 122 animals new to science, including grizzly bears, prairie dogs, and ponderosa pines.
History
Who was the first Holy Roman Emperor?
Charlemagne was one of medieval Europe's most powerful emperors, yet despite his learning and intelligence, he never learned to write.
History
What year did the Roman Empire fall (traditional date)?
Rome's fall was gradual over centuries, not sudden; 476 CE is an arbitrary end date chosen by historians for convenience.
History
Which scientific revolution figure published his heliocentric theory in 1543?
Copernicus delayed publishing his heliocentric theory for decades due to fear of religious persecution and criticism from the scientific establishment.