Ulysses S. Grant U.S. Pres. Ulysses S. Grant, oil on canvas by Thomas Le Clear, c. 1880; in the National Portrait Gallery, Washington, D.C. (more) Insurrection Act United States [1807] Ask the Chatbot a Question More Actions Share Share Share to social media Facebook X URL https://www.britannica.com/topic/Insurrection-Act Feedback Corrections? Updates? Omissions? Let us know if you have suggestions to improve this article (requires login). Feedback Type Select a type (Required) Factual Correction Spelling/Grammar Correction Link Correction Additional Information Other Your Feedback Submit Feedback Thank you for your feedback Our editors will review what you’ve submitted and determine whether to revise the article.

　　External Websites Ask the Chatbot a Question Written by Written by Brian Duignan Brian Duignan is a senior editor at Encyclopædia Britannica. His subject areas include philosophy, law, social science, politics, political theory, and religion. Brian Duignan Fact-checked by Fact-checked by Britannica Editors Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree.... Britannica Editors Last updated Oct. 16, 2025 •History Table of Contents Table of Contents Ask the Chatbot The Insurrection Act is a U.S. federal law passed in 1807 that originally authorized the president of the United States to deploy “such part of the land or naval force of the United States” that the president deems necessary to suppress an insurrection or to enable the local enforcement of federal or state laws. The act thereby expanded the president’s existing authority—under the Militia Acts of 1792 and 1795—to employ state militias to repel invasions...

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