The United States is a country in North America and is made up of 50 states, a federal district, 5 major territories, and 8 outlying islands. The continental US includes 48 states and the District of Columbia. It is bordered to the north by Canada, east by the Atlantic Ocean, west by the Pacific Ocean, and south by Mexico and the Gulf of Mexico. Most common languages are English, with some Spanish. Climates include tundra, temperate, mediterranean, continental-humid, subtropical, and desert. Economically, the US is considered wealthy and highly developed. The US is ethnically diverse. Christianity is the predominate religion, with significant Atheist, Jews, Muslims, and Buddhists. Transportation is mainly by personal vehicle with trains, buses, and subways available in certain cities and for certain routes.