Because that is where the stadium is. There are no stadiums in VA or DC large enough to host an NFL team.
The NFL team is, indeed, the Washington [DC] Redskins
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The Baltimore Ravens are the only NFL team in Maryland. The Washington Redskins play their home games at FedEx Field which is located in Landover, Maryland but the team is based in Washington, DC.
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The Washington Redskins, who moved to DC from Boston in 1937.
They Play In Washington DC.