Surface:USA has a total land area of 9,161,923 sq km.

Population:  USA has approximately 301,759,000 inhabitants with Caucasians and African-Americans as the major ethnic groups.

System of government: USA is a constitution-based federal republic.

Capital: Washington, DC, with an approximate population of 582,000, is the capital of USA.

Religion: Protestants and Roman Catholics constitute majority of the population.

Official Language: USA has no official language, but English is the de facto national language.

Government: USA is a constitution-based federal republic.

Climate: The climate is mostly temperate, but tropical in Hawaii and Florida, arctic in Alaska, semi arid in the Great Plains and arid in the Great Basin in the south-west.

Units of measure and electricity: USA follows the United States units of measurement and the electricity unit is 120 V, 60 Hz.

Time Zone: USA follows four time zones and has daylight saving time.

Currency: US dollars (1 € = 1.47 $)

Travel documents required: A visa is required for entering the US.