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The U.S. Army invades and capture New Mexico in the Mexican American war
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As part of the Compromise of 1850, New Mexico becomes a territory of the United States.
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The Civil War begins Confederate troops occupy southern New Mexico.
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Kit Carson defeats the Navajos, who are then forced on the Long Walk to Bosque Redondo
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The San Carlos Indian reservation is founded in southeastern Arizona thousand of Apaches will be forced to relocate to this distant location far from their homeland
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Sheriff Pat Garrett kills Billy the Kid essentially ending the Lincoln County War.
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New Mexicans prove their loyalty to the Untied States by serving heroically in the Spanish American War especially as members of a cavalry unit known as the Rough Riders.
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Arizona voters reject a plan to enter the union as a single state with New Mexico.
