美国联邦政府主要包括国会、总统、联邦法院三大机构，依据三权分立与联邦制两大政治思想而制定，将立法、司法、行政三种权力分别独立，互相制衡，以避免政府滥权。
英文：
The institutional framework of the US government stems from the US Federal Constitution. The three branches of government - legislative, administrative and judicial powers are separated, each exercising its own specific duties, and at the same time restricting each other.
Governments can be divided into federal and state governments. The drafters of the Constitution reserve the autonomy of the States concerned to the state governments on the basis of the principle that the government must be close to the people so as not to deprive them of their liberty. The state governments themselves have legislative, judicial and administrative powers. The powers of the Federal government are limited to those which the state government cannot exercise alone. Such as taxation, finance, national defense, diplomacy, monetary banks, entry and exit management, foreign trade, national welfare, postal services, and the development of science and art.
扩展资料
1、美国政府的体制有政府、国会的参众议院制度、法院三部分构成。
2、政治上的三权分立指：司法权、行政权和立法权的相对独立。在美国，行政权指政府，立法权指国会的参众议院制度，司法权指法院。三权分立很好的实行了“宪政”的主旨思想。实现了依宪治国的目的，也是法治国家的根本面貌。
3、三权分立（separation of powers）亦称三权分治，是西方民主国家的基本政治制度的建制原则。
参考资料：百度百科——美国联邦政府
