英语回答英国和美国的政治经济制度？

英国政体为君主立宪制

The United Kingdom is a constitutional monarchy: Queen Elizabeth II is head of state of the UK as well as of fifteen other Commonwealth countries, putting the UK in a personal union with those other states. The Crown has sovereignty over the Crown Dependencies of the Isle of Man and the Bailiwicks of Jersey and Guernsey, which are not part of the United Kingdom though the UK government manages their foreign affairs and defence and the UK Parliament has the authority to legislate on their behalf.

美国是宪政联邦***和制

The United States is the world's oldest surviving federation. It is a constitutional republic and representative democracy, "in which majority rule is tempered by minority rights protected by law." The government is regulated by a system of checks and balances defined by the U.S. Constitution, which serves as the country's supreme legal document. In the American federalist system, citizens are usually subject to three levels of government, federal, state, and local; the local government's duties are commonly split between county and municipal governments. In almost all cases, executive and legislative officials are elected by a plurality vote of citizens by district. There is no proportional representation at the federal level, and it is very rare at lower levels.

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