A Mixed Economy: The Role of the Market. The United States is said to have a mixed economy because privately owned businesses and government both play important roles. ... When economic forces are unfettered, Americans believe, supply and demand determine the prices of goods and services.
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William M. Tweed was the boss of a political machine..
The federal government is composed of three distinct branches: legislative, executive, and judicial, whose powers are vested by the U.S. Constitution in the Congress, the president, and the federal courts.
James Madison is the answer you are looking for.
Answer:
they have changed massively
