Answer:
B. Constitutional Monarchy
Explanation:
Constitutional Monarchy is when the ruler has to govern according to the country's constitution of their set of laws.
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There are several reasons why the role of the federal government in civil rights enforcement changed, but the main one is that southern states were not enforcing federal laws.
Old Kingdom: built the Pyramids
Middle Kingdom: conquered Nubia
New Kingdom: conquered Canaan
Truman integrated the armed forces. He put black and white soldiers together in the Vietnam War