Essential Info for the USA
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Population: About 326 million
Capital city: Washington DC
Neighbouring countries: Canada to the north and Mexico to the south.
Geography: The United States is one of the world's largest countries with diverse geographic features ranging from the grasslands of the Great Plains in the east to the harsh desert terrain in the southwest to the infamous Great Lakes in the north.
Political system: Federal presidential constitutional republic
Major religion: Christianity
Main languages: English, Spanish
Money: The US Dollar (USD), divided into 100 cents.
Tipping: Standard 15 to 20 percent in restaurants and taxis.
Time: The USA spans six time zones from GMT-5 to GMT-10. Daylight saving time applies between March and November in all states except Arizona and Hawaii.
Electricity: 120 volts, 60Hz. Standard plugs have two flat pins but three-pin plugs are also used.
Internet domain: .us
International dialling code: +1
Emergency contact: 911
Transport and driving: Traffic drives on the right. There is a comprehensive public transport system in place, including subways, cabs and buses. Cities are well-connected.