A provision of the Treaty of 1818 that expanded the United States also gave it sole control of the Oregon Territory. gave it sole control of West Florida. set the US-Canada border at the forty-ninth parallel. set the US-Spain border in Cuba.

set the US-Canada border at the forty-ninth parallel.

Explanation:

A provision of the Treaty of 1818 that expanded the United States also "set the US-Canada border at the forty-ninth parallel."

This is evident in the fact that the Treaty of 1818 often referred to as "the convention respecting fisheries, boundary and the restoration of slaves" broaden the United States. In the treaty, it was certainly written that "the U.S. - Canada border must be set at the 49th parallel."

set the US-Canada border at the forty-ninth parallel.

Explanation:

macon. i believe thats the answer

sorry if im wrong.