Final answer:
President Jefferson was concerned about France controlling land near the United States due to security and economic reasons.
Step-by-step explanation:
President Jefferson was concerned about France controlling land near the United States because it posed a threat to American security and interests. France had established a significant presence in North America through its ownership of the Louisiana Territory, which stretched from the Mississippi River to the Rocky Mountains. With French control over this vast territory, they could potentially cut off American access to the Mississippi River, disrupt trade routes, and establish strategic military bases on American borders.
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