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Well, as more than a temporary capital, anyway, since George Washington and John Adams were in New York for at least some of their terms. Anyway, the question is as it is on the title: What would some effects on the US be if New York City is the US Capital, including effects on New York City itself? After all, it was pretty close to being done, with a Presidental Mansion even completed in downtown New York near today's Bowling Green: