The earliest known use of the name America is from 1507, when a globe and a large map created by the German cartographer Martin Waldseemüller in Saint-Die-des-Vosges described the combined continents of North and South America. Although the origin of the name is uncertain, the most widely held belief is that expressed in an accompanying book, Cosmographiae Introductio, which explains it as a feminized version of the Latin name of Italian explorer Amerigo Vespucci (Americus Vespucius); in Latin, the other continents' names were all feminine. Vespucci theorized, correctly, that Christopher Columbus, on reaching islands in the Caribbean Sea in 1492, had come not to India but to a "New World".
The Americas were also known as Columbia, after Columbus, prompting the name District of Columbia for the land set aside as the U.S. capital. Columbia remained a popular name for the United States until the early 20th century, when it fell into relative disuse; but it is still used poetically and appears in various names and titles. A female personification of the country is also called Columbia; she is similar to Britannia. Columbus Day, a holiday in the U.S. and other countries in the Americas commemorating Columbus' October 1492 landing.
The term "united States of America" was first used officially in the Declaration of Independence, adopted on 4 July 1776. On 15 November 1777, the Second Continental Congreadopted the Articles of Confederation, the first of which stated "The Stile of this Confederacy shall be 'The United States of America.'"
The adjectival and demonymic forms for the United States are American, a point of controversy among some. 写介绍美国的英语作文2
The United States of America (USA) is the only superpower on this globe now. It is a developed country with diversified cultures such as Asian, European and African. Some people call USA "the melting pot" because of the diversity. USA has a dominating power over economy, education, policitcs, milatary and culture all around the world. It has advanced industries, ideas and some of the smartest scientist on this earth.
But it also has its own problems such as racial discrimination and the widening gap between the rich and the poor.
美利坚合众国（USA）是世界上唯一的一个超级大国.她是一个发达国家,有多元化的文化,像亚洲、欧洲和非洲的.正因为此,有些人把美国称为一个“大熔炉”.
美国现在在世界上的各个领域都雄霸一方,像经济、教育、政治、军事和文化.她有先进的工业、思想,并有全世界一些最聪明的科学家.
但是她也有自己的问题,比如种族歧视和穷富之间逐渐拉大的差距.