- United States - Wikipedia
The United States of America (USA), also known as the United States (U S ) or America, is a country primarily located in North America It is a federal republic of 50 states and a federal capital district, Washington, D C
- United States | History, Map, Flag, Population | Britannica
The United States is a country in North America that is a federal republic of 50 states Besides the 48 conterminous states that occupy the middle latitudes of the continent, the United States includes the state of Alaska, at the northwestern extreme of North America, and the island state of Hawaii, in the mid-Pacific Ocean
- 美国到底是“US”还是“USA”还是“America”? - 知乎
US是United States的缩写，称为“合众国”，前面要加the做限定，写成the United States或theU S 。 United States (US)是对美国最传统和正式的说法。
- United States - The World Factbook
The United States entry in The World Factbook provides a comprehensive overview of the country's geography, people, society, government, economy, and more
- U. S. facts and figures - USAGov
Learn about the duties of president, vice president, and first lady of the United States Find out how to contact and learn more about current and past leaders
- U. S. 、USA、America 有什么区别？ - 知乎
USA是美利坚合众国（United States of America）全称的缩写，但它的应用度远没有U S 广泛，而且一般比较少有U S A 的缩略用法。
- Latest U. S. News | Top headlines from the USA | Reuters
Reuters com is your online source for the latest US news stories and current events, ensuring our readers up to date with any breaking news developments
- United States (US) | Culture, Facts Travel | - CountryReports
The United States is a country primarily located in North America It consists of 50 states, a federal district, five major unincorporated territories, nine Minor Outlying Islands, and 326 Native American reservations
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