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  The Naturalization Act of 1790 is passed. It is only for the good of free white persons-African Americans and American Indians are excluded. Legislative/Executive
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  Thousands of immigrants pour into the United States in the first major immigrant wave in US history.
 National Government
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  The Mexican-American War ends, giving citizenship to 80,000 Mexicans living in Texas and California. Executive/State
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  More waves of immigrants come to the US; their journey is shortened by the invention of steam engines. National government
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  The Naturalization Act of 1906 is passed into law by Theodore Roosevelt, requiring immigrants to learn English before being allowed to become naturalized citizens. Legislative/Executive
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  Two million Italian immigrants arrive to the United States in the peak of Italian immigration.
 National Government
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  During the time of the Great Depression, very few immigrants have either the means or the incentive to come to the US
 Executive/State
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  Asian immigration quadruples in number due to the newly passed Naturalization Act.
 National Government/Executive/Legislative
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  Deferred Action for Childhood Arrivals is signed into law by President Obama, placing thousands of young immigrants under government protection. Legislative/Executive
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  President Trump says that DACA will be repealed, leaving DREAMers with little or no protection from being deported. Mostly Executive, partially Legislative