The Decision to Use the Atomic Bomb & Its Cold War Consequences

Vocabulary flashcards covering key historical figures, events, treaties, and historiographical views surrounding the decision to drop the atomic bomb and its Cold War consequences.

Franklin D. Roosevelt

US President (1933–1945) who authorized the Manhattan Project in 1942 out of fear of Nazi Germany, kept it secret from his Vice President, and died in office in April 1945.

Harry S. Truman

US President who succeeded Roosevelt in April 1945 and made the decision to drop atomic bombs on Hiroshima and Nagasaki to force Japan's unconditional surrender.

Operation Downfall

The planned land invasion of Japan that President Truman publicly cited avoiding as a primary reason for dropping the atomic bombs.

Emperor Hirohito

Emperor of Japan during WWII who made the sacred decision to surrender following the atomic bombings and the Soviet invasion of Manchuria, announced on 15 August 1945.

Joseph Stalin

Leader of the Soviet Union who agreed at Yalta to enter the war against Japan, launched the invasion of Manchuria on 8 August 1945, and knew of the Manhattan Project through Soviet espionage.

Winston Churchill

British Prime Minister during WWII who backed the Manhattan Project under the Quebec Agreement, endorsed using the bomb on Japan, and gave the 1946 Iron Curtain speech.

Quebec Agreement

The agreement under which Britain contributed scientific expertise and resources to the US-led Manhattan Project.

General Leslie Groves

US Army engineer general who directed military operations for the Manhattan Project, selected Oppenheimer to head Los Alamos, and chaired the Target Committee.

J. Robert Oppenheimer

Theoretical physicist known as the father of the atomic bomb, who directed the Los Alamos Laboratory and led the development culminating in the Trinity test.

Trinity test

The first successful test of an atomic bomb, conducted on 16 July 1945 by the Los Alamos scientific team under J. Robert Oppenheimer.

General Douglas MacArthur

Supreme Commander of Allied Powers in the Pacific who oversaw the formal Japanese surrender on 2 September 1945 and led the post-war Allied occupation of Japan.

Nikita Khrushchev

Soviet leader from 1953 who presided over the escalating nuclear arms race and confronted the US during the 1962 Cuban Missile Crisis.

John F. Kennedy

US President (1961–1963) who managed the 1962 Cuban Missile Crisis through a naval blockade and pursued the Partial Nuclear Test Ban Treaty in 1963.

Gar Alperovitz

Revisionist historian who authored Atomic Diplomacy (1965) and argued that the bomb was unnecessary and dropped primarily to intimidate the Soviet Union.

Barton Bernstein

Post-revisionist historian who argued that the bomb decision was a complex least-bad option shaped by multiple factors including ending the war quickly and saving lives.

Traditionalist view

The historiographical argument that using the atomic bomb was militarily necessary to force Japan's quick surrender and save American and Japanese lives.

Revisionist view

The historiographical argument, associated with Gar Alperovitz, that Japan was near surrender and Truman used the bomb primarily for atomic diplomacy against the USSR.

Post-revisionist view

The historiographical argument, associated with Barton Bernstein, that the bomb decision was caused by multiple overlapping factors rather than a single motive.