Commodore Matthew perry negotiated a treaty that opened which country to trade with the united states?

Agreement with Japan.

Explanation:

Matthew Perry made a treaty with Japan in 1853. It was a trade agreement that connected Japan with the Western world in terms of trade. The United States sought to draw Japan into new trade flows to profit from that trade itself. Before that, Japan had been a closed country for about 200 years that did not trade with the Western world.

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