1、The United States of America is a Federal Republic constitutional country Consist of Washington, D.C., 50 states and many overseas territories such as Guam. Its main part is located in the central part of North America.——美利坚合众国是由华盛顿哥伦比亚特区、50个州和关岛等众多海外领土组成的联邦共和立宪国家。

2、The United States is a highly developed capitalist country. In the two world wars, the United States and other allies won. After decades of cold war, the United States became the only superpower after the collapse of the Soviet Union.——美国是一个很发达的资本主义国家，在两次世界大战中，美国和其他盟国取得胜利，经历数十年的冷战，在苏联解体后，成为唯一的超级大国。