求翻译：美利坚合众国（USA）是一个由50个州和一个联邦直辖特区组成的宪政联邦制共和制国家，东濒大西洋，西临太平洋，北靠加拿大，南接墨西哥。美国是个多文化和多民族的国家；国土面积超过962万平方公里，位居全球第三或第四；人口总量超过三亿人，居世界第三。1776年7月4日，大陆会议在费城正式通过《独立宣言》，宣告美国诞生。自1870年以来美国国民经济就高居全球第一，是联合国安理会五个常任理事国之一，当今的国内生产总值超过全球20%。其在经济、政治、科技、军事、娱乐等诸多领域的巨大影响力均领衔全球，是目前世界上唯一的超级大国。是什么意思？

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The United States (USA) is a by 50 states and one federal Special Administrative Region (SAR) under a constitutional Federal Republic, the Atlantic Ocean and to the west by the Pacific Ocean, the North by Canada, South to Mexico. The US is a multi-cultural and multi-ethnic States; land area of more

American (USA) is one the constitutional government federal system republican system country which is composed by 50 states and a federation directly under special zone, east is close to Atlantic, west is near the Pacific Ocean, north depends on Canada, south meets Mexico.US is a cultural and the mu

United States of America (USA) is a 50 States and one federal territory comprising of the SAR's constitutional federal Republican State, East Atlantic, West to the Pacific Ocean, North of Canada, South of Mexico. United States is a multicultural and multi-ethnic country; the land area over 9.62 mill

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