The end of the Cold War, the rise of domestic and international terrorism, and the increasing significance of the parties' views on foreign policy.
Political parties or factions began to emerge during the struggle to ratify the federal Constitution of 1787.They became more at odds as the focus shifted from the creation of a new federal government to its potential power.
Over the years, political parties and the policies they advocated changed. Democrats and Republicans were the two main political parties in the twentieth century.
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