Explanation:
Separation of Powers in the Central Government. One important principle embodied in the U.S. Constitution is separation of powers. To prevent concentration of power, the U.S. Constitution divides the central government into three branches and creates a system of checks and balances.
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Premarital Cohabitation might best be characterized as trial marriage.
Answer: It is related to Westward Expansion because the US was expanding westward by annexing Texas.