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Thomas Jefferson is elected president, ushering in an era of Democratic domination that lasted until the Civil War.
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Andrew Jackson's Democratic Party includes small farmers, slaveholders, and frontier pioneers.
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The republican Party is born, attracting many former Whigs and anti-slavery Democrats
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The election of Abraham Lincoln and the start of the Civil War mark the beginning of 75 years of Republican Party supremacy.
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The Depression brings about a shift in the roles of government and, led by FDR, a return of the Democrats to power.
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From this selection on, neither party consistently holds the presidency, and Congress is often controlled by the opposing party.