After becoming Chancellor of Germany in 1933, Hitler swiftly consolidated power, anointing himself FÜHRER (supreme leader) in 1934. Obsessed with the idea of the superiority of the “pure” German race, which he called ARYAN, Hitler believed that war was the only way to gain the necessary LEBENSRAUM, or living space, for the German race to expand. In the mid-1930s, he secretly began the rearmament of Germany, a violation of the Versailles Treaty. After signing alliances with Italy and Japan (THE TRIPARTITE PACT & THE ANTI-COMINTERN PACT) against the Soviet Union, Hitler sent troops to occupy Austria in 1938 and the following year ANNEXED CZECHOSLOVAKIA. Hitler’s open aggression went unchecked, as the United States and Soviet Union were concentrated on internal politics at the time, and neither France nor Britain were eager for confrontation after such great losses in World War I.
In late August 1939, Hitler and Soviet leader Joseph Stalin signed the GERMAN-SOVIET NONAGGRESSION PACT, which guaranteed that Poland would be split between Hitler and Stalin. Hitler had long planned an invasion of Poland, a nation to which Great Britain and France had guaranteed military support if it were attacked by Germany. The pact with Stalin meant that Hitler would not face a war on two fronts once he invaded Poland and would have Soviet assistance in conquering and dividing the nation itself. On September 1, 1939, Hitler invaded Poland from the west; two days later, France and Britain declared war on Germany, beginning World War II.
On September 17, Soviet troops invaded Poland from the east. Under attack from both sides, Poland fell quickly, and by early 1940 Germany and the Soviet Union had divided control over the nation.
On April 9, 1940, Germany simultaneously invaded Norway and occupied Denmark, and the war began in earnest. On May 10, German forces swept through Belgium and the Netherlands in what became known as “BLITZKRIEG,” or lightning war. Three days later, Hitler’s troops crossed the Meuse River and struck French forces at the northern end of THE MAGINOT LINE, an elaborate chain of fortifications constructed after World War I. The Germans broke through the line with their tanks and planes and continued to the rear. The British Expeditionary Force (BEF) was evacuated by sea from DUNKIRK in late May, while in the south French forces mounted a doomed resistance. With France on the verge of collapse, Italy’s fascist dictator BENITO MUSSOLINI formed an alliance with Hitler, THE PACT OF STEEL, and Italy declared war against France and Britain on June 10. On June 14, German forces entered Paris; France requested an armistice two days later. Hitler now turned his attention to Britain, which had the defensive advantage of being separated from the Continent by the English Channel.
To pave the way for an amphibious invasion (dubbed OPERATION SEA LION), German planes bombed Britain extensively beginning in September 1940 until May 1941 including night raids on London and other industrial centers that caused heavy civilian casualties and damage. THE ROYAL AIR FORCE (RAF) eventually defeated the LUFTWAFFE (German Air Force) in the Battle of Britain, and Hitler postponed his plans to invade. With Britain’s defensive resources pushed to the limit, Prime Minister Winston Churchill began receiving crucial aid from the U.S. under the LEND-LEASE ACT, passed by Congress in early 1941.
By early 1941, Hungary, Romania and Bulgaria had joined the Axis, and German troops overran Yugoslavia and Greece that April. Hitler’s conquest of the Balkans was a precursor for his real objective: an invasion of the Soviet Union, whose vast territory would give the German master race the “Lebensraum” it needed. The other half of Hitler’s strategy was the EXTERMINATION OF THE JEWS from throughout German-occupied Europe. Known as THE HOLOCAUST, more than 4 million Jews would perish in the death camps established in occupied Poland.
On June 22, 1941, Hitler ordered the invasion of the Soviet Union, codenamed OPERATION BARBAROSSA. Though Soviet tanks and aircraft greatly outnumbered the Germans’, Russian aviation technology was largely obsolete, and the impact of the surprise invasion helped Germans get within 200 miles of Moscow by mid-July. Arguments between Hitler and his commanders delayed the next German advance until October, when it was stalled by a Soviet counteroffensive and the onset of harsh winter weather.
With Britain facing Germany in Europe, the United States was the only nation capable of combating Japanese aggression, which by late 1941 included an expansion of its ongoing war with China and the seizure of European colonial holdings in the Far East. On December 7, 1941, 360 Japanese aircraft attacked the major U.S. naval base at PEARL HARBOR in Hawaii, taking the Americans completely by surprise and claiming the lives of more than 2,300 troops. The attack on Pearl Harbor served to unify American public opinion in favor of entering World War II, and on December 8 Congress declared war on Japan with only one dissenting vote. Germany and the other Axis Powers promptly declared war on the United States.
After a long string of Japanese victories, the U.S. Pacific Fleet won THE BATTLE OF MIDWAY in June 1942, which proved to be a turning point in the war. On Guadalcanal, one of the southern Solomon Islands, the Allies also had success against Japanese forces in a series of battles from August 1942 to February 1943. In mid-1943, Allied naval forces began an aggressive counterattack against Japan, involving a series of amphibious assaults on key Japanese-held islands in the Pacific. This “ISLAND-HOPPING” strategy proved successful, and Allied forces moved closer to their ultimate goal of invading the mainland Japan.
In North Africa, British and American forces had defeated the Italians and Germans by 1943. An Allied invasion of Sicily and Italy followed, and Mussolini’s government fell in July 1943.
On the Eastern Front, a Soviet counteroffensive launched in November 1942 ended the bloody BATTLE OF STALINGRAD, which had seen some of the fiercest combat of World War II. The approach of winter, along with dwindling food and medical supplies, spelled the end for German troops there, and the last of them surrendered on January 31, 1943.
On June 6, 1944–celebrated as “D-DAY”–the Allies began a massive invasion of Europe, landing 156,000 British, Canadian and American soldiers on the BEACHES OF NORMANDY, France. In response, Hitler poured all the remaining strength of his army into Western Europe, ensuring Germany’s defeat in the east. Soviet troops soon advanced into Poland, Czechoslovakia, Hungary and Romania, while Hitler gathered his forces to drive the Americans and British back from Germany in the BATTLE OF THE BULGE, the last major German offensive of the war.
By the time Germany formally surrendered on May 8, Allied forces had occupied much of the country. Hitler was already dead, having died by suicide on April 30 in his Berlin bunker.
At the POTSDAM CONFERENCE of July-August 1945, U.S. President Harry S. Truman, Churchill and Stalin discussed the ongoing war with Japan as well as the peace settlement with Germany. Post-war Germany would be DIVIDED INTO FOUR OCCUPATION ZONES, to be controlled by the Soviet Union, Britain, the United States and France. On the divisive matter of Eastern Europe’s future, Churchill and Truman acquiesced to Stalin, as they needed Soviet cooperation in the war against Japan.
Heavy casualties sustained in the campaigns at IWO JIMA and OKINAWA and fears of the even costlier land invasion of Japan led Truman to authorize the use of a new and devastating weapon. Developed during a top-secret operation code-named THE MANHATTAN PROJECT, the ATOMIC BOMB was unleashed on the Japanese cities of HIROSHIMA AND NAGASAKI in early August. On August 15, the Japanese government issued a statement declaring they would accept the terms of the Potsdam Declaration, and on September 2, U.S. General Douglas MacArthur accepted Japan’s formal surrender aboard the USS Missouri in Tokyo Bay.