Answer:Political factions or parties began to form during the struggle over ratification of the federal Constitution of 1787. Friction between them increased as attention shifted from the creation of a new federal government to the question of how powerful that federal government would be.
America went from being mostly Republican in the 1920s to mostly Democratic in the 1930s. This was due to America becoming much more urban, and the Great Depression. Franklin D. Roosevelt formed a coalition that would mostly last until 1964 called the "New Deal coalition." During this period, the parties switched.
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