The United States of America (USA), commonly known as the United States (U.S.) or America, is a country primarily located in North America. It is a federal republic consisting of 50 states and a federal district, Washington, D.C. The 48 contiguous states share land borders with Canada to the north and Mexico to the south. Alaska is a semi-exclave in the northwest, and Hawaii is an archipelago in the Pacific Ocean.
The U.S. is known for its diverse geography, ranging from mountains in the west to a broad central plain and low mountains in the east. It boasts vast national parks and nature reserves, such as the Everglades in Florida, the Rocky Mountains in Colorado, and Yellowstone National Park. The U.S. has a technologically powerful and advanced mixed economy. It is a leader in technological advances, especially in computers, pharmaceuticals, medical, aerospace, and military equipment. The U.S. is a global leader in innovation and higher education.
