The capital of the world's leading superpower is a city unlike any other in the United States -- not just in symbolism but in its legal and political structure.

President Donald Trump's repeated threats to impose his will on the city has brought its unique status back into the spotlight.

Washington D.C. is a bustling urban center with schools and businesses serving 700,000 residents -- but is also the seat of national power, home to the White House, Capitol and Supreme Court.

This dual identity often places local interests at odds with federal oversight, in a city where democracy is on display daily, even as the locals themselves lack full democratic rights.

Unlike the 50 states, the city operates under a unique relationship with the federal government that limits its autonomy and gran

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