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🇺🇸AP US History Review

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Unit 4, 1800-1848

Unit 4, 1800-1848

Written by the Fiveable Content Team • Last updated August 2025
Verified for the 2026 exam
Verified for the 2026 examWritten by the Fiveable Content Team • Last updated August 2025

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Unit 4 is when the United States begins to grow into its own identity as a country. It includes massive expansions of democracy through Jefferson & Jackson, the economic and social upheaval of the Market Revolution and Second Great Awakening, and also sees continued migration westward.