What does Module 3 of the LEAP US History test cover?

Module 3 covers World War I and the 1920s, roughly 1914 to 1929, bridging Standard 3 (Isolationism through the Great War) and Standard 4 (Becoming a World Power through World War II). It includes the causes of World War I and the reasons the United States moved from neutrality to entry; the American military role and the home front, including mobilization, propaganda, civil-liberties restrictions, and the Great Migration; the Treaty of Versailles, the failed fight over the League of Nations, and the return to isolationism; the prosperity and mass culture of the Roaring Twenties; the decade's cultural conflicts; and the Harlem Renaissance.

Why did the United States enter World War I?

The United States stayed neutral for nearly three years, but three pressures pulled it in. Germany's unrestricted submarine warfare sank ships without warning, including the Lusitania in 1915, costing American lives. The Zimmermann Telegram of 1917 revealed a German proposal that Mexico attack the United States. And deep economic and cultural ties to the Allies, to whom American banks and factories had lent and sold heavily, made an Allied defeat costly. After Germany resumed unrestricted submarine warfare, President Wilson asked Congress to declare war in April 1917 to make the world safe for democracy.

Why did the United States reject the Treaty of Versailles?

President Wilson championed the treaty and its centerpiece, the League of Nations, an international body to prevent future wars. But the United States Senate refused to ratify the treaty, largely because senators, led by Henry Cabot Lodge, feared that the League's collective-security commitment in Article X would drag the country into foreign wars without the consent of Congress. Wilson refused to compromise, and the treaty failed. As a result the United States never joined the League it had helped design and turned back toward isolationism and a return to normalcy.

What made the 1920s both prosperous and conflicted?

The Roaring Twenties brought real prosperity built on mass production, consumer credit, the automobile, and new media such as radio and movies, along with changing roles for women symbolized by the flapper. But the prosperity was uneven, leaving farmers, many workers, and most African Americans behind, and it rested on rising debt and stock speculation. The decade also seethed with cultural conflict: Prohibition spawned bootlegging and crime, nativist immigration quotas slammed the door on newcomers, a revived Ku Klux Klan spread nationwide, and the Scopes Trial dramatized the clash between fundamentalism and modern science.

What was the Harlem Renaissance and why did it matter?

The Harlem Renaissance was the flowering of African American literature, art, and music in the 1920s, centered in Harlem and made possible by the Great Migration that brought Black Americans north. Writers such as Langston Hughes and Zora Neale Hurston, and the rise of jazz with deep roots in New Orleans, expressed a new pride in Black identity often called the New Negro. Alongside it, Marcus Garvey built a mass movement of Black nationalism. The movement permanently enriched American culture and built confidence and institutions that helped fuel the later civil rights movement, even as segregation persisted.

LouisianaUS History

LEAP US History Module 3 World War I and the Twenties: a complete overview of the Great War, American entry, the peace, the Roaring Twenties, and the decade's cultural conflicts

A deep-dive guide to Module 3 of the Louisiana LEAP US History test: the causes of World War I and American entry, the American role and the home front, the Treaty of Versailles and the return to isolationism, the prosperity and mass culture of the Roaring Twenties, the decade's cultural conflicts, and the Harlem Renaissance, with the source-based item patterns LEAP repeats.

Generated by Claude Opus 4.818 min readLouisiana Student Standards for Social Studies, US History Standards 3 and 4Updated 2026-06-02

Reviewed by: AI editorial process; not yet individually human-reviewed

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What Module 3 actually demands
The causes of World War I and American entry
The American role and the home front
The peace and the return to isolationism
The Roaring Twenties
The cultural conflicts of the 1920s
The Harlem Renaissance
Check your knowledge

What Module 3 actually demands

Module 3 spans World War I and the 1920s (roughly 1914 to 1929), bridging Standard 3 (Isolationism through the Great War) and Standard 4 (Becoming a World Power through World War II). It tells how the United States was drawn into a world war, helped win it, then turned away from the peace it had shaped, and how the decade that followed both roared with modern prosperity and seethed with cultural conflict. The LEAP work is source based throughout: read a document (the Zimmermann Telegram, a war poster, a treaty excerpt, an advertisement, a poem) and use it as evidence.

This guide ties together the matching dot-point pages, each with its own practice questions: the causes of World War I and American neutrality, the United States in World War I, the home front and the peace, the Roaring Twenties, the culture wars of the 1920s, and the Harlem Renaissance and the New Negro.

The causes of World War I and American entry

World War I began in 1914, driven by the M-A-I-N causes (militarism, alliances, imperialism, nationalism) and sparked by the assassination of Franz Ferdinand. The United States declared neutrality, but unrestricted submarine warfare (including the Lusitania), the Zimmermann Telegram, and economic ties to the Allies pulled it in. In April 1917 Wilson asked Congress to declare war "to make the world safe for democracy."

The American role and the home front

The United States raised an army through the draft and sent the AEF to France, helping the Allies win in 1918. At home, total mobilization meant coordinating industry, selling Liberty Bonds, and conserving food. Propaganda rallied support, while the Espionage and Sedition Acts (upheld in Schenck) curbed civil liberties. The war opened jobs for women and drew African Americans north in the Great Migration.

The peace and the return to isolationism

Wilson's Fourteen Points and his League of Nations shaped the Treaty of Versailles (1919), which also imposed harsh terms on Germany. But the Senate rejected the treaty over fears the League would entangle the country in foreign wars, so the United States never joined the League and turned back to isolationism and a return to normalcy. The first Red Scare showed wartime fear carrying into peacetime.

The Roaring Twenties

The 1920s boomed on mass production, consumer credit, the automobile, and new media (radio, movies), with changing roles for women symbolized by the flapper. But the prosperity was uneven, leaving farmers and many others behind, and rested on debt and speculation that would help cause the Great Depression.

The cultural conflicts of the 1920s

The decade also saw fierce conflict between modern and traditional America: Prohibition (which spawned bootlegging and crime), nativist immigration quotas, a revived Ku Klux Klan targeting immigrants, Catholics, and Jews, and the Scopes Trial clash between fundamentalism and modern science.

The Harlem Renaissance

The Great Migration gave rise to the Harlem Renaissance, a flowering of African American literature, art, and music (and jazz, rooted in New Orleans) that expressed a new pride in Black identity, the "New Negro," alongside Marcus Garvey's Black nationalism.

Revision order

Track the arc: long-term M-A-I-N causes plus a spark start the war; the United States stays neutral until submarine warfare, the Zimmermann Telegram, and economic ties pull it in; it helps win the war and mobilizes the home front; then it rejects the Treaty of Versailles and the League and retreats into isolationism. The 1920s then show two faces at once: a modern consumer boom (mass production, the car, radio, the flapper) and a cultural backlash (Prohibition, immigration quotas, the Klan, the Scopes Trial), with the Harlem Renaissance flowering out of the Great Migration. Lock in the specifics LEAP tests: the M-A-I-N causes and the three reasons for entry; Schenck and the limits on speech; why the Senate rejected the League; installment buying and uneven prosperity; and the New Orleans roots of jazz.

Module 3 of the LEAP US History test covers World War I and the 1920s (about 1914 to 1929), bridging Standards 3 and 4. The war began from the M-A-I-N causes; the United States stayed neutral until unrestricted submarine warfare, the Zimmermann Telegram, and economic ties to the Allies brought it in during 1917. It raised an army through the draft, mobilized the home front with bonds and propaganda, curbed civil liberties through the Espionage and Sedition Acts, and saw the Great Migration of African Americans north. Wilson's Fourteen Points shaped the Treaty of Versailles and the League of Nations, but the Senate rejected the treaty and the country returned to isolationism. The Roaring Twenties brought mass production, consumer credit, the car, and new media, with uneven prosperity, alongside cultural conflicts over Prohibition, immigration, the revived Klan, and evolution. The Great Migration also produced the Harlem Renaissance and its flowering of Black literature, jazz, and pride. The recurring LEAP skills are source analysis and building an evidence-based claim.

Check your knowledge

A mix of recall and application questions covering Module 3. Attempt them under timed conditions, then check against the solutions.

Name the four long-term causes of World War I summarized as M-A-I-N. (4 marks)
State two reasons the United States entered World War I. (2 marks)
Explain the significance of the Zimmermann Telegram. (2 marks)
Describe two ways the United States mobilized the home front. (2 marks)
Explain the ruling in Schenck v. United States. (2 marks)
Define the Great Migration and give one push and one pull factor. (3 marks)
State the purpose of the League of Nations and why the United States did not join. (2 marks)
Explain two foundations of the 1920s consumer economy. (2 marks)
Explain why the prosperity of the 1920s was uneven. (2 marks)
Explain why Prohibition is considered a failed experiment. (2 marks)
Describe the purpose and nativist motive of the 1920s immigration quotas. (2 marks)
Explain how the Harlem Renaissance was connected to the Great Migration. (2 marks)

Solutions

Q1: Militarism, alliances, imperialism, and nationalism.
Q2: Any two of: unrestricted German submarine warfare (the Lusitania); the Zimmermann Telegram; close economic and cultural ties to the Allies.
Q3: The Zimmermann Telegram was a secret German proposal that Mexico attack the United States in exchange for lost territory; its release outraged Americans and helped push the country into the war.
Q4: Any two of: coordinating industry for war production; selling Liberty Bonds to finance the war; conserving food and fuel; bringing new workers (women, Southern migrants) into factories.
Q5: Schenck v. United States (1919) upheld limits on free speech, ruling that speech could be restricted when it created a "clear and present danger," such as obstructing the draft in wartime.
Q6: The Great Migration was the large-scale movement of African Americans from the rural South to Northern cities. Pull: wartime factory jobs. Push: the segregation, violence, and poverty of the Jim Crow South.
Q7: The League of Nations was meant to settle disputes peacefully and prevent future wars through collective security. The United States did not join because the Senate rejected the Treaty of Versailles over fears of being pulled into foreign wars.
Q8: Mass production on the assembly line (lowering prices) and consumer credit through installment buying (letting people buy more sooner).
Q9: Farmers suffered low prices and debt, and many workers and most African Americans saw little of the boom, while the expansion rested on rising debt and stock speculation.
Q10: Prohibition did not end demand for alcohol; it created speakeasies, bootlegging, and organized crime, proved unenforceable, and was repealed in 1933.
Q11: The quotas sharply limited immigration and favored northern and western Europeans while restricting southern and eastern Europeans and barring most Asians, reflecting a nativist desire to preserve an older ethnic makeup of the country.
Q12: The Great Migration brought hundreds of thousands of African Americans to Northern cities such as New York, and this concentration of people and talent in neighborhoods like Harlem made the cultural flowering possible.

Sources & how we know this

2025-2026 Assessment Guide for US History (LEAP 2025) — Louisiana Department of Education (2025)
K-12 Louisiana Student Standards for Social Studies — Louisiana Department of Education (2022)