The United States of America （USA）‚ commonly known as the United States （U․S․ or US） or America‚ is a country mostly located in central North America‚ between Canada and Mexico․ It consists of 50 states‚ a federal district‚ five major self-governing territories‚ and various possessions․ At 3․8 million square miles （9․8 million km2）‚ it is the world's third- or fourth-largest country by total area․ With a 2019 estimated population of over 328 million‚ the U․S․ is the third most populous country in the world․ Americans are a racially and ethnically diverse population that has been shaped through centuries of immigration․ The capital is Washington‚ D․C․‚ and the most populous city is New York City․ 【翻訳】
