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15 multiple-choice questions and 5 flashcards on World War II (1939-1945), about 6% of the High School U.S. History bank. Every one carries a written rationale.
World War II (1939-1945) is one of 13 chapters in CoStudy's High School U.S. History bank, and it holds 15 of the bank's 270 multiple-choice questions — roughly 6% of the total. That proportion is not arbitrary: chapters follow the certifying body's published exam outline, and the number of questions in each is set by that domain's published weight, so the share of your practice time this chapter takes matches the share of the real exam it accounts for.
Studying by chapter is worth doing once you have a diagnostic score. A single overall percentage tells you whether you are close; it does not tell you which domain is dragging. Working a weak chapter in isolation, and re-testing it in isolation, is the fastest way to move a score that has stalled — and it is why the mock exams in CoStudy report by domain rather than as one number.
9 questions drawn from this chapter, with the full rationale shown — the controlling principle behind the right answer, and why each wrong option tempts and fails.
The Manhattan Project was:
Answer: D — The secret U.S. program to develop atomic weapons, led by scientists including J. Robert Oppenheimer
Manhattan Project = atomic weapons development at Los Alamos, Oak Ridge, and Hanford. C is the Marshall Plan — commonly confused as 'the plan for rebuilding after the war.'
Executive Order 9066 (1942) authorized:
Answer: B — The forced relocation and internment of approximately 120,000 people of Japanese ancestry from the West Coast
EO 9066 led to internment camps upheld in Korematsu (1944). Executive Order 8802 (1941) banned defense-industry discrimination; EO 9981 (1948) desegregated the military — commonly confused wartime orders.
The Lend-Lease Act (1941) allowed the U.S. to:
Answer: B — Supply war material to Allied nations without immediate cash payment
Lend-Lease ended pretense of strict neutrality — the U.S. became the 'arsenal of democracy' before formally entering the war. The peacetime draft (Selective Training and Service Act) came in 1940.
The 'Double V' campaign during WWII called for victory:
Answer: B — Abroad against fascism and at home against racial discrimination — energizing the postwar civil-rights movement
The Pittsburgh Courier's Double V linked war aims to Black civil rights and previewed postwar activism. Option A misreads the phrase as a two-front war slogan.
World War II in Europe began in September of what year, with Germany's invasion of Poland?
Answer: C — 1939
September 1, 1939. 1937 was the Japan-China war escalation, 1938 the Munich Agreement, 1940 the fall of France. Watch the late-1930s date-swap trap.
The U.S. dropped atomic bombs on which two Japanese cities in August 1945?
Answer: C — Hiroshima and Nagasaki
Hiroshima (August 6) and Nagasaki (August 9). Kyoto was reportedly removed from the target list because of its cultural significance. Tokyo suffered devastating conventional firebombing but not an atomic strike.
The Gilded Age (1870s–1900) was characterized by:
Answer: D — Rapid industrialization, concentration of wealth among 'robber barons' (Rockefeller, Carnegie, Vanderbilt), corruption, urbanization, immigration
Mark Twain's term: 'gilded' = thin gold layer over corruption. Industrial titans, monopolies, labor strife, mass immigration (esp. from Southern/Eastern Europe), political machines. Led to Progressive Era reform.
The 14th Amendment (1868) provides:
Answer: A — Birthright citizenship, equal protection under the law, and due process for all persons within US jurisdiction — Cornerstone of civil rights
14th Amendment: citizenship for all born in US, equal protection clause, due process clause. Basis for desegregation (Brown v. Board), reproductive rights, marriage equality, many other Supreme Court rulings.
The Japanese attack on Pearl Harbor occurred on:
Answer: A — December 7, 1941
December 7, 1941 — 'a date which will live in infamy.' D-Day was June 6, 1944, and September 1, 1939 was Germany's invasion of Poland.
4 cards from the 5 in this chapter.
What were the Nuremberg Trials?
Post-WWII international military tribunals (1945–46) that prosecuted Nazi leaders for war crimes and crimes against humanity.
What was the GI Bill (1944)?
Provided returning WWII veterans with college tuition, low-interest home and business loans, and unemployment benefits — fueled the postwar middle class.
What was the Holocaust?
Nazi Germany's systematic genocide of about six million European Jews, plus millions of Roma, Slavs, disabled, and others.
What was Japanese American internment?
Forcible relocation of ~120,000 Japanese Americans (most U.S. citizens) to camps under Executive Order 9066 (1942), upheld in Korematsu v. U.S.
These are a sample. The full World War II (1939-1945) chapter runs 20 items with per-chapter progress tracking, on the web and in the iOS app.
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