In September of 1791.
Washington, DC is a city. DC represents the name District of Columbia. Washington is the name of the city.
One of them is the Washington Post
George Washington University in Washington DC.
Washington DC
Washington, DC
The Washington Monument is in Washington DC.
Washington DC
Shabangband !
the capital of the world
Arlington
Washington, DC
Washington DC is the name of a place, which means it is a proper noun.Proper nouns are the names of specific people (George Washington, Marie Antoinette), the names of specific places (Washington DC, Japan), or specific things (Oreo, Toyota Prius).