To help match the descriptions with the appropriate locations typically represented on a historical map, here’s a brief explanation of each item:
A. Territory shared under the Convention of 1818
This convention mainly addressed the border between the United States and Canada and allowed both nations to share the Oregon Territory.
B. Territory granted to the United States in the Adams-Onis Treaty
The Adams-Onis Treaty of 1819 ceded Florida from Spain to the United States.
C. Boundary of United States agreed to in the Convention of 1818
The boundary agreed upon was the 49th parallel, which established the border between Canada and the United States west of the Great Lakes.
D. Boundary of United States agreed to in the Adams-Onis Treaty
The treaty established the boundary between Spanish territories and US territory, notably determining the southern border of the US at that time.
To visualize these matches on a map, look for the 49th parallel for item C, the Florida territory for item B, and the designated Oregon area for items A and D depending on how those boundaries are demarcated.