Dividing political power between a central authority and other units, like the states in the United States, is the main concept of "federalism," since this allows for states to exercise a certain amount of autonomy while still allowing the federal government to control the most important issues facing the nation.
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The correct answer is is an "Open Primary" is one in which vote for the candidates of the party they desire. In closed primaries only party members can vote. Wide-open and independent are irrelevant terms in this context.
