7.9 World War II: Military

US Entry and Global Strategy

The US officially entered WWII after the attack on Pearl Harbor (Dec 7, 1941). Allied leaders adopted a 'Europe First' strategy, prioritizing defeat of Nazi Germany while fighting a holding action against Japan. Major turning points included the Battle of Midway (1942, halted Japanese naval expansion) and D-Day/Normandy invasion (June 6, 1944, opened a western front against Germany).

Defeating the Axis Powers

The Allies (US, Britain, Soviet Union) coordinated a two-front war. In Europe, Allied forces pushed toward Germany after D-Day, while Soviet troops advanced from the east; Germany surrendered in May 1945 (V-E Day). In the Pacific, the US used island-hopping to retake territory. The war ended after the US dropped atomic bombs on Hiroshima and Nagasaki (August 1945), leading to Japan's surrender (V-J Day).

Mobilization and Wartime Choices

The US harnessed its industrial and technological power to mass-produce weapons, ships, and planes, becoming the 'Arsenal of Democracy.' The decision to use atomic weapons remains debated: proponents cite avoiding a costly invasion of Japan, while critics question the necessity and human cost. The war cemented the US as a dominant global military power.

Key terms

Pearl Harbor

Dec 7, 1941 surprise Japanese attack on the US naval base in Hawaii, prompting US entry into WWII.

Battle of Midway

1942 naval battle where the US decisively defeated Japan's navy, turning the tide in the Pacific.

D-Day (Normandy Invasion)

June 6, 1944 Allied invasion of France that opened a western front against Nazi Germany.

Island-hopping

US military strategy of capturing key Pacific islands while bypassing heavily fortified ones to advance toward Japan.

Atomic bombings

US dropped atomic bombs on Hiroshima and Nagasaki in August 1945, leading to Japan's surrender and the war's end.

Try an AP-style question

The D-Day invasion (June 6, 1944) took place in…

1. Normandy, France
2. North Africa
3. Sicily, Italy
4. Iwo Jima