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The Bill of Rights
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Lawsuits against States
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Presidential Elections
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Industrial Revolution
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Abolition of Slavery
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Civil Rights
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Black suffrage
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Income Taxes
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Senatorial Elections
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Prohibition of Liquor
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Women's Suffrage
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Terms of Office
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Repeal of Prohibition
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Term Limits of the Presidency
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Washington, D.C., Suffrage
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Abolition of poll taxes
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Presidential Succession
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18 year old suffrage
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Congressional Pay Raises