USA
The United States is the world's third or fourth largest nation by total area, ranking behind Russia and Canada. The land area of the United States is 3 million square miles.
The climate The United States includes most climate types. The climate ranges from continental in the north to subtropical in the south. The Great Plains are semi-arid. Most of Alaska is subarctic or polar.
The coastal plain of the Atlantic seaboard gives way further inland to deciduous forests and the rolling hills of the Piedmont. The Appalachian Mountains divide the eastern seaboard from the Great Lakes and the grasslands of the Midwest.
The Mississippi– Missouri River, the world's fourth longest river system, runs mainly north–south through the heart of the country. The Rocky Mountains reaching altitudes higher than 14, 000 feet (4, 300 m) in Colorado.
Government and politics The United States is a constitutional republic. The government is defined by the U. S. Constitution, which serves as the country's supreme legal document. The White House used by the U. S. President The federal government is composed of three branches: The legislative powers are exercised by the bicameral Congress Executive: The president is the commander-in-chief of the military. Judicial: The Supreme Court and lower federal courts.