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No US dollar coins dated 1818
The Treaty of 1818 resolved British and American boundary issues in the Great Lakes area and the boundaries of Minnesota. The Adams-Onis Treaty purchased Florida. The Eastern US now had secure and defined borders.
The Treaty of 1818 was important to the United States because it solved boundary disputes with Britain. It also allowed Americans to create settlements in Oregon.
The flag was changed because Kentucky and Vermont were added as states.
Illinois became the 21st US state in 1818.