Lesson 2: World War II

Lesson Focus

This lesson explores Hitler's early blitzkrieg victories across Europe. We'll see how Allied resistance and the entry of the United States shifted the war's momentum, setting the stage for an unconditional Axis surrender.

People to Know

Franklin D. Roosevelt

Learning Objectives

• Analyze Germany's early military gains through blitzkrieg and its key losses against Britain and the Soviet Union.
• Explain the events, particularly the attack on Pearl Harbor, that led the United States to enter the war.
• Describe how U.S. involvement created the Grand Alliance and turned the tide of the war in Europe and Asia.

Hitler used a tactic called blitzkrieg, or “lightning war,” to achieve rapid victories. First, fast-moving panzer divisions supported by airplanes smashed through Polish defenses in 1939.

Germany then bypassed France’s Maginot Line in 1940, trapping Allied forces at Dunkirk. This strategy allowed Germany to conquer most of western Europe quickly, though Britain, with its strong resolve, remained undefeated.

The U.S. initially maintained a policy of isolationism and neutrality.

Hitler’s plans stalled when he faced determined resistance on two fronts.

First, the German air force, the Luftwaffe, tried to gain control of the skies over Britain in the Battle of Britain (1940) but was fought off. Believing Britain’s resolve relied on Soviet help, Hitler then invaded the Soviet Union in June 1941.

However, a harsh winter and fierce Soviet resistance halted the German advance, marking the first major stop to Hitler's army.

Japan's desire for an empire in Asia led to direct conflict with the United States.

Seeking resources, Prime Minister Hideki Tojo approved a surprise attack on the U.S. fleet. On December 7, 1941, Japanese planes bombed Pearl Harbor in Hawaii, aiming to cripple American naval power. The attack ended American isolationism and unified the country.

The U.S. entered the war, leading to Germany's declaration of war and escalating the conflict globally.

America's entry into the war created a powerful new coalition to fight the Axis.

The United States, Great Britain, and the Soviet Union formed the Grand Alliance, setting aside political differences to focus on military victory. A key part of their strategy was to demand unconditional surrender from the Axis Powers (Germany, Italy, and Japan).

Pay special attention: This cemented their involvement and made it impossible for Hitler to divide them, ensuring a united front.

The Grand Alliance began to push back German forces with key victories. In North Africa, British and American forces defeated German troops in 1942. The most decisive turning point came at the Battle of Stalingrad (November 1942 – February 1943), where the Soviet army encircled and destroyed the entire German Sixth Army. This crushing defeat was a disaster for Germany, which now could not win the war on the Eastern Front.

The United States reversed Japan's momentum with critical naval victories.

The Battle of the Coral Sea in May 1942 stopped Japan’s southward advance. The major turning point came at the Battle of Midway Island on June 4, 1942, where U.S. forces sank four Japanese aircraft carriers.

After this defeat, the U.S. began its "island hopping" campaign, putting Japan on the defensive and establishing American naval superiority in the Pacific.