when did the united states enter world war 2 in europe
December 1941
title: Allies of World War II text: war on Japan, and Japan's allies Germany and Italy declared war on the US, bringing the US into World War II. On 8 December 1941, following the attack on Pearl Harbor, the United States Congress declared war on Japan at the request of President Franklin D. Roosevelt. This was followed by Germany and Italy declaring war on the United States on 11 December, bringing the country into the European theatre. The US-led Allied forces in the Pacific theatre against Japanese forces from 1941 to 1945. From 1943 to 1945, the US-led and coordinated the Western Allies' war effort in Europe title: Military history of the United States during World War II text: and adjacent eastern Lorraine, but could not clear central Alsace. During Operation Nordwind in December 1944, the 19th Army attacked north out of the Pocket in support of other German forces attacking south from the Saar into northern Alsace. In late January and early February 1945, the French First Army (reinforced by the U.S. XXI Corps) cleared the Pocket of German forces. By early 1945, events favored the Allied forces in Europe. On the Western Front the Allies had been fighting in Germany since the Battle of Aachen in October 1944 and by January had turned back the Germans in title: World War II text: late 1939 to early 1941, in a series of campaigns and treaties, Germany conquered or controlled much of continental Europe, and formed the Axis alliance with Italy and Japan. Under the Molotov–Ribbentrop Pact of August 1939, Germany and the Soviet Union partitioned and annexed territories of their European neighbours, Poland, Finland, Romania and the Baltic states. Following the onset of campaigns in North Africa and East Africa, and the fall of France in mid 1940, the war continued primarily between the European Axis powers and the British Empire. War in the Balkans, the aerial Battle of Britain, the Blitz, and title: Military history of the United States during World War II text: because General Eisenhower replaced Fredendall with General Patton. Slowly the Allies stopped the German advance in Tunisia and by March were pushing back. In mid April, under British General Bernard Montgomery, the Allies smashed through the Mareth Line and broke the Axis defense in North Africa. On 13 May 1943, Axis troops in North Africa surrendered, leaving behind 275,000 men. Allied efforts turned towards Sicily and Italy. The first stepping stone for the Allied liberation of Europe was, in Prime Minister Winston Churchill's words, the "soft underbelly" of Europe on the Italian island of Sicily. Launched on 9 July 1943, title: Causes of World War II text: destroyers escorting convoys and German U-boats were already de facto at war in the Battle of the Atlantic. This declaration effectively ended isolationist sentiment in the U.S. and the United States immediately reciprocated, formally entering the war in Europe. Causes of World War II Among the causes of World War II were Italian fascism in the 1920s, Japanese militarism and invasion of China in the 1930s, and especially the political takeover in 1933 of Germany by Adolf Hitler and his Nazi Party and its aggressive foreign policy. The immediate cause was Germany invading Poland on September 1, 1939, and Britain