On Dec. 7, 1941, Pearl Harbor is attacked by the Japanese, who kill more than 2,000 Americans and cause the United States to rethink its policy of neutrality in the war.
After a year of fraught relations and tension, the big three leaders meet in Tehran. Will they find the unity they need to help the Allies win the war?
More than 156,000 British, American and Canadian soldiers are transported across the English Channel in the largest seaborne invasion ever attempted; "The Big Three" come face to face for the second and last time in the town of Yalta.