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Great Britain retained six forts in the Great Lakes region after the Treaty of Paris. They remained in British hands until the United States acquired them peacefully through diplomatic means.
The ones located within the Northwest Territory were:
In addition, Britain controlled these forts in modern New York:
All of these forts were ceded to the United States by the Jay Treaty in 1796. However, several of them were reoccupied by British troops during the War of 1812.