 September 16: United States military conscription bill passed (Draft initiated)  November 5: Roosevelt re-elected U.S. president.

 June 14: United States freezes German and Italian assets in America.  July 26: Roosevelt freezes Japanese assets in United States and suspends relations.  August 1: United States announces an oil embargo against aggressor states.  August 14: Roosevelt and Churchill announce the Atlantic Charter.  December 7: Japanese bomb Pearl Harbor.  December 8: United States and Britain declare war on Japan.  December 11: Hitler declares war on United States.

 January 26: First American forces arrive in Great Britain.  In April: Japanese-Americans sent to relocations centers.  August 7: US forces lands in Guadalcanal.  August 17: First all-American air attack in Europe.  November: The "big three," Roosevelt, Churchill, and Stalin, convene in Teheran, Iran to discuss the invasion of Italy. It is the first time all three have met.  December 2: Professor Enrico Fermi sets up a atomic reactor in Chicago.  December 17: U.S. declares that mass executions of Jews by Nazis will be avenged.

 January 14-24: (Casablanca Conference) Roosevelt announces that war can only end with “unconditional German surrender”  January 27: First bombing raid by Americans on Germany (at Wilhelmshaven).  February 14-25: Battle of Kasserine Pass between the U.S. 1 st Armor Division and German Panzers in North Africa.  July 9-10: Allies land in Sicily.  July 19: Allies bomb Rome.  July 22: Americans capture Palermo, Sicily  July 27-28: Allied air raid causes a firestorm in Hamburg.  August 17: American daylight air raids on Regensburg and Schweinfurt in Germany; Allies reach Messina, Sicily  October 1: Allies enter Naples, Italy  November 28: Roosevelt, Churchill, Stalin meet at Tehran.

 January 22: Allies land at Anzio in Italy.  February 15-18: Allies bomb monastery at Monte Cassino.  March 4: First major daylight bombing raid on Berlin by the Allies.  March 15: Second Allied attempt to capture Monte Cassino begins.  May 11: Allies attack Gustav Line south of Rome.  June 5: Allies enter Rome.  June 6: D-Day landings on the northern coast of France.  June 27: U.S. troops liberate Cherbourg France.  July 25-30: Operation Cobra (U.S. troops break out West of St. Lo  August 20: Allies encircle Germans in the Falaise Pocket.

 January 16: U.S. 1 st and 3 rd Armies link up after a month long separation during the Battle of the Bulge  February 4-11: Roosevelt, Churchill, Stalin meet at Yalta  March 7: US forces cross the Rhine on the Remegen bridge.  May 7: Unconditional surrender of all German forces to Allies.  May 8: V-E day.  June 5: Allies divide up Germany and Berlin and take over the government.