The USA, c1920–55: boom, bust and recovery

Overview

This study covers a pivotal 35-year period in American history, tracking the nation's journey from the unprecedented economic boom of the 1920s, through the devastating collapse of the Great Depression in the 1930s, to the remarkable post-war recovery and social transformation of 1945–55. Examiners expect candidates to demonstrate a deep understanding of causation (why the boom happened and why it ended), consequence (the impact of the Depression and the New Deal), and the extent of change (how much society truly transformed for different groups). You must be able to deploy specific knowledge—such as the impact of the GI Bill, the realities of McCarthyism, and the significance of the Brown v. Board of Education ruling—to evaluate historical interpretations and construct balanced arguments.

Listen to the companion podcast below for a comprehensive audio review of the entire topic, featuring exam tips and a quick-fire recall quiz:

Key Events & Developments

The Economic Boom of the 1920s

Date(s): 1920–1929

What happened: Following the First World War, the USA experienced rapid economic growth. This was driven by mass production techniques (pioneered by Henry Ford), the expansion of credit and hire purchase, and laissez-faire Republican government policies that kept taxes low and tariffs high to protect domestic industries.

Why it matters: This period established the modern consumer society. However, the uneven distribution of wealth and underlying structural weaknesses in agriculture and banking directly caused the subsequent economic collapse.

Specific Knowledge: By 1929, the USA produced 46% of the world's industrial output. Ford produced a Model T every 10 seconds. However, 60% of Americans still lived below the poverty line.

The Wall Street Crash and Great Depression

Date(s): October 1929 – 1939

What happened: Panic selling on the New York Stock Exchange led to a market collapse, wiping out billions in value. This triggered a severe economic depression characterised by mass unemployment, bank failures, and widespread poverty (symbolised by 'Hoovervilles').

Why it matters: The Depression fundamentally changed the relationship between the American people and their government, ending the era of laissez-faire capitalism and ushering in federal intervention.

Specific Knowledge: Unemployment peaked at 25% (around 14 million people) in 1933. Approximately 5,000 banks collapsed between 1929 and 1933. Industrial production halved.

Roosevelt's New Deal

Date(s): 1933–1939

What happened: President Franklin D. Roosevelt introduced a series of federal programmes designed to provide Relief, Recovery, and Reform. This included massive public works projects, agricultural subsidies, and the introduction of social security.

Why it matters: The New Deal expanded the role of the federal government and provided crucial relief, though historians debate its ultimate economic success. It reshaped American politics, creating a new Democratic coalition.

Specific Knowledge: The Civilian Conservation Corps (CCC) employed 3 million young men. The Works Progress Administration (WPA) employed 8.5 million. The Social Security Act of 1935 introduced the first national system of pensions and unemployment insurance.

Post-War Prosperity and Suburbanisation

Date(s): 1945–1955

What happened: Following WWII, the USA experienced another massive economic boom. The GI Bill provided veterans with mortgages and education funding, leading to the rapid growth of suburbs (like Levittown) and a new, affluent middle class.

Why it matters: This era defined the 'American Dream' and modern consumer culture, but also highlighted persistent racial inequalities, as many Black Americans were excluded from suburban housing through redlining.

Specific Knowledge: The GI Bill (1944) spent $16 billion and sent 8 million veterans to college. By 1955, 17 million new homes had been built. Television ownership rose from 1 million in 1948 to 32 million in 1955.

McCarthyism and the Red Scare

Date(s): 1947–1954

What happened: Amidst Cold War tensions, a profound fear of communist infiltration gripped the USA. Senator Joseph McCarthy led aggressive, often baseless investigations into government employees, while HUAC targeted the entertainment industry.

Why it matters: McCarthyism demonstrates the severe domestic impact of the Cold War, showing how international tensions compromised civil liberties and created a climate of political conformity and fear.

Specific Knowledge: The Hollywood Ten were jailed in 1947 for refusing to testify before HUAC. Julius and Ethel Rosenberg were executed in 1953 for alleged espionage.

Early Civil Rights Progress

Date(s): 1945–1955

What happened: The post-war decade saw the beginnings of the modern civil rights movement. Key milestones included the desegregation of the armed forces and successful legal challenges to the 'separate but equal' doctrine by the NAACP.

Why it matters: These events laid the crucial legal and political groundwork for the mass protests of the 1960s, though examiners expect candidates to note that practical implementation of desegregation was fiercely resisted in the South.

Specific Knowledge: President Truman's Executive Order 9981 (1948) desegregated the military. The landmark Brown v. Board of Education Supreme Court ruling (1954) declared segregated public schools unconstitutional, overturning the 1896 Plessy v. Ferguson decision.

Key Individuals

Herbert Hoover

Role: 31st US President (1929–1933)

Key Actions: Responded to the Wall Street Crash with a philosophy of 'rugged individualism' and limited federal intervention. Eventually introduced the Reconstruction Finance Corporation, but it was seen as too little, too late.

Impact: Became the scapegoat for the Depression (hence 'Hoovervilles'). His failure to provide direct relief led to a landslide defeat in 1932.

Franklin D. Roosevelt (FDR)

Role: 32nd US President (1933–1945)

Key Actions: Implemented the New Deal, fundamentally changing the role of the federal government in the economy and society.

Impact: Restored public confidence (through 'fireside chats') and provided crucial relief, though his policies did not fully end the Depression until WWII.

Senator Joseph McCarthy

Role: Republican Senator from Wisconsin

Key Actions: Claimed to have lists of communists working in the State Department. Led aggressive Senate hearings to root out alleged subversives.

Impact: Created a climate of fear and paranoia that ruined thousands of careers. His eventual downfall in 1954 marked the decline of the Red Scare.

Chief Justice Earl Warren

Role: Chief Justice of the US Supreme Court (1953–1969)

Key Actions: Authored the unanimous decision in Brown v. Board of Education (1954).

Impact: His ruling that "separate educational facilities are inherently unequal" dismantled the legal basis for Jim Crow segregation.

Second-Order Concepts

Causation

Examiners frequently ask why the 1920s boom occurred or why the Wall Street Crash happened. Strong answers distinguish between long-term structural weaknesses (like agricultural depression and unequal wealth) and short-term triggers (like panic selling).

Consequence

The consequences of the Great Depression were both immediate (mass unemployment, homelessness) and long-term (the permanent expansion of federal power through the New Deal). Similarly, the GI Bill had the long-term consequence of creating the modern American middle class.

Change & Continuity

When evaluating the period 1945–55, you must balance change (economic prosperity, suburbanisation, legal victories for civil rights) with continuity (persistent poverty for minorities, de facto segregation in the South, the ongoing fear of communism).

Significance

The significance of events like Brown v. Board of Education lies not just in their immediate impact, but in how they shifted the legal landscape and empowered future activism.

Source Skills

When evaluating sources for this period, provenance is crucial. A source from a New Deal agency will likely exaggerate its successes, while a source from a Republican opponent will highlight its failures or costs. For McCarthyism, consider the climate of fear—was the author protecting themselves? Always analyze: Content (what it says), Provenance (who, when, why), and Limitations (what it omits or its inherent bias).