The term "capitol" with an O is a building that houses the government.
The US Capitol building is on Capitol Hill in Washington, DC, and is the meeting place of the US Congress.
The capital, or capital city, with an A, is Washington, a city within the federal District of Columbia, which is most often named as Washington, DC.
Washington D.C.
because United states :Unites
It depends on what unites states you speak of.
Yes
50
No
16000 slaves were in the united states
United States is commonly used as a noun, but it can function as an adjective. For example: The Unites States Navy (describing which Navy) The United States border (specificing which border)
To work
mostly protestant
50
Obama
It is New England