[T]oday’s Insurrection Act can be traced all the way to the Calling Forth Act of 1792. In the 230 years since then, the Insurrection Act has been invoked in response to 30 crises.
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1873-May-22 The results of the 1872 gubernatorial election in Louisiana were contested between white supremacist Democrats and pro-Reconstruction Republicans, which threw the state's politics into turmoil and led to widespread violence, especially in rural areas. The violence reached its apogee on April 13, 1873 in Colfax, Louisiana, when a heavily armed white mob massacred between 60 and 150 black militiamen after they surrendered (sources differ as to the number of victims). A month after the Colfax massacre, President Grant issued a proclamation under the Insurrection Act, calling on the belligerents in Louisiana to disperse. However, no additional federal troops were deployed other than those already stationed in Louisiana as part of Reconstruction.
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1874-May-15 The Brooks-Baxter War. The 1872 Arkansas gubernatorial election was disputed between two Republican candidates, Elisha Baxter and Joseph Brooks. In 1874, Brooks, who had narrowly lost the election, attempted to overthrow Baxter's government. Both parties gathered their own militia forces and engaged in an extended stand-off, punctuated by occasional incidents of violence. All the while, federal troops stationed in the area as part of Reconstruction interposed themselves between the two forces in order to forestall the outbreak of full war. In May, after the state assembly was finally able to meet and declare Baxter the winner, President Grant ratified their decision and invoked the Insurrection Act, ordering the supporters of Brooks to disperse, who did so without the need for additional federal troops.
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1874-Sep-15 Continued disputes over the 1872 gubernatorial election in Louisiana culminated in a violent white supremacist coup d'état in New Orleans - then the state capital - in 1874. President Grant invoked the Insurrection Act and deployed troops, who drove the insurrectionists out of the city and reinstated the ousted governor. However, the insurgents established their own competing government, which effectively controlled much of Louisiana outside of New Orleans for the next three years. This situation persisted until the federal troops protecting New Orleans were withdrawn as part of the Compromise of 1877, and white supremacist "Redeemers" fully took control of the state.
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1876-Oct-17 In advance of the 1876 South Carolina gubernatorial election, thousands of white supremacists in South Carolina who opposed Reconstruction organized into heavily armed paramilitary groups known as "rifle clubs." Worried that these groups would interfere with the election and were too large to be controlled with the state militia, the governor appealed to President Grant for military aid. Grant issued a proclamation under the Insurrection Act ordering the clubs to disperse, and sent additional federal troops to South Carolina to reinforce those already stationed there. These troops kept the peace after the election, remaining until all federal forces were withdrawn from the former Confederacy as part of the Compromise of 1877.