The Third Party System refers to a period in American political history, primarily from the 1850s to the 1890s, characterized by the dominance of two major political parties, the Democratic Party and the Republican Party, alongside the emergence of various third parties. This system saw intense political competition and significant social changes, shaping the future landscape of American politics. It also marked the decline of older party systems and highlighted the impact of issues like slavery and economic policy on party alignment.
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