What country owns land southwest of the Louisiana Purchase?

Spain.

Explanation:

The Louisiana Purchase is colored by a lightish blue. South west is land controlled by Spain, and later Mexico when they won their independence from Spain.

Louisiana Purchase, western half of the Mississippi River basin purchased in 1803 from France by the United States; at less than three cents per acre for 828,000 square miles (2,144,520 square km), it was the greatest land bargain in U.S. history.

Explanation:

the correct answers are 1, 2 5, 6