The United States of America, which is known in the United States as the United States, is a federal republic of 50 states, Washington, DC, five autonomous territories, and outer islands. The US 48 states and the Federal District are located in central North America,. The United States also has a number of offshore territories and islands in the Caribbean and the Pacific. In addition, the United States has 374 overseas military bases in more than 140 countries and regions around the world.
The United States has a land area of 9.82 million square kilometers, ranking third in the world (defined as the fourth largest country by land area). At the same time, it has nearly 300 million people and is the third most populous country in the world. Because of the large number of immigrants from all over the world, it is One of the countries with the most ethnic and cultural values in the world. The terrain and climate of the United States are complex and diverse, and are home to a variety of wildlife.
In 1781, the "Confederations Ordinance" was passed in 13 constituent states of the Confederacy and formed the Confederation Parliament. The 1787 "Constitution of the United States of America" was finalized, and the "United States of America" was reorganized into a federal system, and the federal government was established.
As a highly developed country, the United States is the world's largest importer and the second largest commodity exporter. The United States is a world-famous and far-reaching force in politics and culture, and it also holds world leadership in scientific research and technological innovation.
