Question

求一段介绍或关于美国政体的英文介绍，最好长一点，简单一点。

Answer 1

1 The United States of American is a federal constitutional republic country with 5o states and a federal district.(美利坚合众国是一个联邦共和制国家，拥有50个独立州和一个联邦特区）2 The United States has operated under two-party system(美国实行两党制），the major two parties are Democratic party(民主党），and Republic Party(共和党）（两大主要政党分别是民主党和共和党）
3 while the latter is considered to be conservative (后者，指共和党，相对路线保守），4 and the former one is liberal to some extent(前者，民主党则相对路线自由）5 The federal government is composed of three branches(美国政府实行三权分立）：6 the congress(议会）has the power of declaring wars（宣战） ,impeachment(弹劾）and approving treaties(通过议案）。（议会享有宣战，弹劾，以及通过议案等权利）7 the president is the commander-in-chief(总司令）of the military(总统享有最高军事权）8 the supreme court(最高法庭）and lower federal court(地方法庭）could overturn laws if they are unconstitutional(如果最高法庭和地方法庭发现法律不合法，它们均有权推翻原法案）。