为指定的文本段落生成一个简短但准确的摘要。


【原文段落】The United States of America (USA), commonly known as the United States (U.S. or US) or simply America, is a country primarily located in North America. It consists of 50 states, a federal district, five major self-governing territories, and various possessions. At 3.8 million square miles, it is the world's third- or fourth-largest country by total area.【提示】生成一个3句话的段落。
美国是北美洲的一个国家，包括50个州、一个联邦区、五个主要自治领土和各种领地。它的总面积为380万平方英里，是世界第三或第四大的国家。