What agreement made the existence of the united states official in 1783?

The Treaty of Paris, signed in Paris by representatives of King George III of Great Britain and representatives of the United States of America on September 3, 1783, ended the American Revolutionary War.

The Treaty of Paris

The Treaty of Paris, signed by the US and Great Britain, brought the US formal diplomatic recognition and made it so the British would, theoretically, stop harassing American trading vessels and allow the US to trade throughout the world.

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i believe your answer is d)