Final answer:
The Treaty of 1818 set boundaries and brought long-term peace between the United States and Great Britain.
Explanation:
The provision of the Treaty of 1818 that expanded the United States was the set boundary between the United States and Canada at the Rocky Mountains. This treaty also addressed issues that were not resolved in the Treaty of Ghent, leading to several agreements that brought long-term peace between the United States and Great Britain.
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