Learn on PengiPengi Social Studies (Grade 4)Chapter 7: 20th Century Challenges: Depression and War

Lesson 2: California: The Arsenal of Democracy

In this Grade 4 Social Studies lesson from Chapter 7, students explore California's critical role in World War II by examining the dramatic growth of shipbuilding and aircraft manufacturing that earned the state its reputation as the "Arsenal of Democracy." Students evaluate the injustice of Japanese American internment under Executive Order 9066 and analyze how the Bracero Program shaped California's agricultural economy by bringing Mexican workers to fill labor shortages during the war.

Section 1

The Arsenal of Democracy

When World War II began, California became the "Arsenal of Democracy." Factories worked day and night to build ships (like the Liberty Ships in Richmond) and airplanes. This defense industry boom finally ended the Great Depression.

With men away fighting, the workforce changed. Women took factory jobs for the first time, symbolized by "Rosie the Riveter." African Americans also moved to California cities for these jobs. This industrial surge transformed California into a manufacturing powerhouse.

Section 2

Injustice at Home

War brought fear and prejudice. After Japan attacked Pearl Harbor, the U.S. government issued Executive Order 9066. This order forced 120,000 Japanese Americans—most of whom were U.S. citizens—to leave their homes and businesses.

They were sent to internment camps like Manzanar in the California desert. They lived in barracks behind barbed wire, despite having done nothing wrong. Years later, the government apologized for this unjust violation of civil rights.

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Chapter 7: 20th Century Challenges: Depression and War

  1. Lesson 1

    Lesson 1: The Great Depression and the 'Dust Bowl'

  2. Lesson 2Current

    Lesson 2: California: The Arsenal of Democracy

Lesson overview

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Section 1

The Arsenal of Democracy

When World War II began, California became the "Arsenal of Democracy." Factories worked day and night to build ships (like the Liberty Ships in Richmond) and airplanes. This defense industry boom finally ended the Great Depression.

With men away fighting, the workforce changed. Women took factory jobs for the first time, symbolized by "Rosie the Riveter." African Americans also moved to California cities for these jobs. This industrial surge transformed California into a manufacturing powerhouse.

Section 2

Injustice at Home

War brought fear and prejudice. After Japan attacked Pearl Harbor, the U.S. government issued Executive Order 9066. This order forced 120,000 Japanese Americans—most of whom were U.S. citizens—to leave their homes and businesses.

They were sent to internment camps like Manzanar in the California desert. They lived in barracks behind barbed wire, despite having done nothing wrong. Years later, the government apologized for this unjust violation of civil rights.

Book overview

Jump across lessons in the current chapter without opening the full course modal.

Continue this chapter

Chapter 7: 20th Century Challenges: Depression and War

  1. Lesson 1

    Lesson 1: The Great Depression and the 'Dust Bowl'

  2. Lesson 2Current

    Lesson 2: California: The Arsenal of Democracy