Is washington dc a city or a state?

Is Washington, D.C., formally the District of Columbia and commonly referred to as Washington, the District, the Capital or simply D.C., the capital of the United States founded on July 16, 1790 an instance of the class city (urban area substantially bigger than a town) or the class state (an area with its own territory, government and people which may or may not lie within the authority of a larger state or federal union)?

Facts Show facts

Show reasoning Reasoning

I followed this chain of reasoning:

By calculation (generator: ["in_group@trueknowledge.com"]) I know that:
city is in the group city and state

state is in the group city and state

By calculation (generator: ["now@trueknowledge.com"]) I know that:
The current time is May 19th 2013, 20:14:40

I know from locally stored knowledge that:
Fact 1: Washington, D.C. is a city ([fact: ["1146253@trueknowledge.com"]])

Fact 1 is true for 2006 onwards ([fact: ["7620306@trueknowledge.com"]])

By calculation (generator: ["timeperiodtopoint@trueknowledge.com"]) I know that:
Fact 1 is true at May 19th 2013, 20:14:40

I used the following facts to provide this answer:

Washington, D.C. has been a city since at least 2006

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