[["1941", 1453.0], ["The United States entered the war in 1941 as the result of Japan bombing the American Fleet in Pearl Harbor, Hawaii on December 7, 1941. Japanese Admiral, Isoroku Yamamoto, famously said \"I fear all we have done is to awaken a sleeping giant and fill him with a terrible resolve\"", 778.0], ["The United States officially entered World War II on December 11th, 1941.  This was four days after the attack on Pearl Harbor.", 229.0], ["The United States officially entered World War 2 on December 11, 1941. Mobilization began when the United States declared war on Japan on December 8, 1941, one day after the attacks on Pearl Harbor", 223.0]]
what year did the united states enter world war two
history