What nation was the main U.S. rival for control of the Old Southwest after the Revolution?

Name: What nation was the main U.S. rival for control of the Old Southwest after the Revolution?
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Spain was the main U.S. rival for control of the Old Southwest after the Revolution, as it held territories in Florida and the western regions adjacent to the Mississippi River, which were areas of strategic and expansionist interest to the young United States.

What Nation Was the Main U