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Congress established the new rules for citizenship through naturalization with the Naturalization Clause in the U.S. Constitution.
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National citizenship is granted to "free" white people. Only white male property owners were able to hold the status of a U.S. citizen.
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The Treaty of Hidalgo was signed following the Spanish American War. It extended U.S. citizenship to anyone living in the territories that were annexed to the United States.
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The fourteenth amendment was amended to include all U.S. citizens born or naturalized in the U.S. including formerly enslaved people.
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The Naturalization Act of 1870 extended naturalization rights to "aliens of African nativity or African decent".
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Citizens of Puerto Rico were given U.S. citizenship.
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Citizenship was granted to any Native Americans born within the United States.
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To become a U.S. citizen by naturalization, racial restrictions were no longer in place.