Final answer:
The Louisiana Purchase provided the United States with control of the Mississippi River, a vital waterway for commercial agriculture in the Midwest.
Step-by-step explanation:
The geographic benefit of the Louisiana Purchase was that the United States obtained control of the Mississippi River, which was essential for the growth of commercial agriculture in the Midwest. The Mississippi River served as a major transportation route for the movement of goods and crops, allowing farmers to easily ship their products to markets in the East. This facilitated the expansion of agriculture in the region and contributed to its economic development.
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