How did the United States return to isolationism, and what fears gripped the nation after World War I?
Explain the US return to isolationism after World War I and the postwar unrest, including the first Red Scare, labor strife, racial violence, and the rise of nativism in the early 1920s (Ohio's Learning Standards for Social Studies, American History, Foreign Affairs from Imperialism to Post-World War I).
A standard-level answer on the postwar years for Ohio's American History EOC: the return to isolationism after World War I, the first Red Scare and the Palmer Raids, the labor strikes and racial violence of 1919, the revived Ku Klux Klan, the Sacco and Vanzetti case, and the new immigration quotas.
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What this topic is asking
This part of the Foreign Affairs topic asks how the United States turned back to isolationism after World War I, and how fear and intolerance gripped the country in 1919 to 1920: the first Red Scare, labor and racial violence, a revived Ku Klux Klan, and new immigration restrictions. It bridges the war years and the 1920s.
The return to isolationism
Disillusioned by the war and the failed peace, most Americans wanted to stay out of world affairs:
This is the policy the Ohio standards highlight: having become a world power, the United States chose to step back in the 1920s.
The first Red Scare
The Russian Revolution (1917) created the first communist state and frightened Americans:
- A series of bombings and labor unrest in 1919 fed fears of a radical plot.
- Attorney General A. Mitchell Palmer launched the Palmer Raids (1919 to 1920), mass arrests and deportations of suspected anarchists, socialists, and communists, often trampling civil liberties.
The panic faded by 1920, but it left a pattern of equating dissent and immigration with subversion.
Unrest in 1919 and after
The postwar years were violent and divided:
- Labor strife. Millions of workers struck in 1919 (steel, coal, even the Boston police), and the public often blamed "Reds."
- Racial violence. The "Red Summer" of 1919 saw deadly race riots in cities as returning Black veterans and Great Migration migrants faced white mobs.
- The revived Ku Klux Klan. A new KKK spread far beyond the South in the 1920s, targeting Black Americans, Catholics, Jews, and immigrants.
- Sacco and Vanzetti. Two Italian immigrant anarchists were convicted and executed for robbery and murder in a trial many saw as driven by anti-immigrant and anti-radical prejudice.
Nativism and immigration quotas
Fear of foreigners and radicals produced lasting immigration restriction:
- The Emergency Quota Act (1921) and the National Origins Act / Immigration Act of 1924 set quotas that favored northern and western Europeans and sharply limited immigrants from southern and eastern Europe, while barring most Asians.
These laws ended the era of mass open immigration and reflect the nativism the standards trace from the 1880s through the 1920s.
Why this matters for the EOC
This topic rewards vocabulary (isolationism, Red Scare, nativism, quota), cause and effect (the Russian Revolution and bombings to the Red Scare; fear to immigration limits), and continuity (nativism from the Chinese Exclusion Act to the 1924 quotas). It also carries the civil liberties theme (the Palmer Raids), linking back to Schenck.
Try this
Q1. What caused the first Red Scare, and how did the government respond? [2]
- Cue. The Russian Revolution and a wave of bombings caused a fear of communism; the government responded with the Palmer Raids and deportations.
Q2. Name one 1920s immigration law and describe its effect. [2]
- Cue. The Emergency Quota Act (1921) or the Immigration Act of 1924; they set quotas that sharply cut immigration from southern and eastern Europe and barred most Asians.
Exam-style practice questions
Practice questions written in the style of ODEW exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
Ohio American History EOC1 marksThe first Red Scare of 1919 to 1920 was mainly a fear of (A) German invasion. (B) communism and radical revolution. (C) a stock market crash. (D) Prohibition.Show worked answer →
A 1-point multiple-choice item on the postwar years.
The correct answer is B. After the 1917 Russian Revolution, Americans feared that communists ("Reds"), anarchists, and radicals would spread revolution at home, leading to the Palmer Raids and deportations.
A belongs to the war itself; C is 1929; D is unrelated. The test rewards linking the first Red Scare to fear of communism and radicalism.
Ohio American History EOC2 marksAfter World War I the United States returned to isolationism and limited immigration. (a) What is isolationism? (b) Give one example of how the United States restricted immigration in the 1920s.Show worked answer →
A 2-point constructed-response item on the postwar turn.
(a) 1 point: a foreign policy of avoiding alliances and involvement in other nations' affairs, especially European conflicts.
(b) 1 point: the immigration quota laws of the 1920s (the Emergency Quota Act of 1921 and the National Origins / Immigration Act of 1924), which set quotas that sharply cut immigration from southern and eastern Europe and barred most Asians. Scorers reward defining isolationism plus a quota-law example.
Related dot points
- Explain the World War I home front, including mobilization, propaganda, limits on civil liberties, and the Great Migration, and the failed peace through Wilson's Fourteen Points, the Treaty of Versailles, and the rejection of the League of Nations (Ohio's Learning Standards for Social Studies, American History, Foreign Affairs from Imperialism to Post-World War I).
A standard-level answer on the World War I home front and peace for Ohio's American History EOC: war mobilization and propaganda, limits on civil liberties (the Espionage and Sedition Acts, Schenck v. United States), the Great Migration, Wilson's Fourteen Points, the Treaty of Versailles, and the US rejection of the League of Nations.
- Explain the causes of World War I, the reasons the United States abandoned neutrality and entered the war, and the major contributions of American forces (Ohio's Learning Standards for Social Studies, American History, Foreign Affairs from Imperialism to Post-World War I).
A standard-level answer on US entry into World War I for Ohio's American History EOC: the MAIN causes of the war, American neutrality, the reasons for entry (submarine warfare, the Lusitania, the Zimmermann Telegram), and the impact of American forces on Allied victory.
- Explain the causes of American imperialism, the Spanish-American War of 1898, the acquisition of overseas territories, and the debate between imperialists and anti-imperialists (Ohio's Learning Standards for Social Studies, American History, Foreign Affairs from Imperialism to Post-World War I).
A standard-level answer on American imperialism for Ohio's American History EOC: the economic, strategic, and ideological causes, the Spanish-American War of 1898, the acquisition of the Philippines, Puerto Rico, and Guam, the annexation of Hawaii, and the imperialist versus anti-imperialist debate, with Ohio's President McKinley.
- Explain the cultural conflicts of the 1920s, including Prohibition, the Scopes trial, nativism and the revived Ku Klux Klan, and changing roles for women (Ohio's Learning Standards for Social Studies, American History, Prosperity, Depression and the New Deal).
A standard-level answer on 1920s cultural conflict for Ohio's American History EOC: Prohibition and bootlegging, the Scopes trial and fundamentalism versus modernism, nativism and the revived Ku Klux Klan, and the new roles of women and flappers, with the tension between rural and urban America.
- Explain how the prosperity of the 1920s, mass production, consumer credit, the automobile, and new mass culture transformed American society (Ohio's Learning Standards for Social Studies, American History, Prosperity, Depression and the New Deal).
A standard-level answer on the Roaring Twenties for Ohio's American History EOC: the postwar economic boom, mass production and the assembly line, the automobile, consumer credit and advertising, radio and movies, and the new mass culture, with the Ohio rubber and auto-parts economy.
Sources & how we know this
- Ohio's Learning Standards for Social Studies — Ohio Department of Education and Workforce (2019)
- American History (High School State-Tested Courses Resources) — Ohio Department of Education and Workforce (2024)