The Treaty of Paris ended the Revolutionary War and determined the American borders to be between

Mississippi River and the Atlantic Ocean

Explanation:

The treaty of Paris was signed by the representative of the United States along with King George III. At that time, these regions provided the colonists with enough space to obtain a wide variety of resources and a clear pathway to conduct international trading with other nations. (in Europe, Africa, and Asia)

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supplies had to travel a long distance across water on ships that were often attacked, so they did not reach europe