Big if true
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It was a city state, an empire of it's own for a very long time.
Tokyo? Hasn't the Kanto region been part of Japan for over a millenium?
Yes, I didn't mean last Tuesday.
Tokyo became a city, and the seat of the shogunate, in 1603. (Before that it was a fishing village in Musashi Province.) It became the capital of Japan in 1868, and has stayed so ever since. It was never a city-state.