The two party system began to emerge during the ratification of the constitution in 1824, shortly before the Civil War.
The American two-party system emerged in the late 18th century with the formation of the Federalist Party and the Democratic-Republican Party. This system was shaped by differences in ideology regarding the role of the national government and policy direction. Although other parties have since appeared, the two-party structure has continued to be a staple of American politics.
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