The Adams-Onis Treaty resolved issues between Spain and the United States concerning Florida and Louisiana.

The statement is True

Explanation:

The United States and Mexico have a long history as American and Spanish people fought for land in the past. The border between the two countries established in 1819 by the Adams Onis Treaty (the Florida Purchase Treaty) between the United States and Spain. The border defined in the region of the western side of the Mississippi River. The border was again reaffirmed in 1828 through the Treaty of Limits after Mexico got its independence from Spain.  

d. dr. francis collins

spanish executed counts egmont and horne in brussels.