United States — Capital, Flag and Country Facts
Explore United States: capital Washington D.C., population, flag, geography, languages, history and culture.
United States is in North America. Its capital is Washington D.C..
- Population
- 345,426,000
- Area
- 9,833,520 km²
- Currency
- US Dollar (USD)
- Languages
- English
Climate
Mostly temperate, but ranges from tropical in Hawaii and Florida to arctic in Alaska. The Great Plains are semi-arid, while the Southwest is arid desert.
Terrain
Vast central plain with mountains in the west and hills/low mountains in the east. Rugged volcanic topography in Hawaii and Alaska.
Facts
The US has the world's oldest written constitution still in use today.
Alaska is simultaneously the westernmost, easternmost, and northernmost US state.
The US Interstate Highway System requires one mile in every five to be straight, originally for emergency aircraft landings.
History
1776: Declaration of Independence signed, founding the United States
1787: US Constitution drafted at the Philadelphia Convention
1861: Civil War begins between the Union and Confederate states
1945: United States emerges as a superpower after World War II
1969: Apollo 11 lands the first humans on the Moon