Answer:
D) Spain
Step-by-step explanation:
Spain closed the Mississippi River to U.S. shipping in 1784 as a retaliation for the United States allowing smuggling across the Spanish border in Florida. This closure hurt the commerce of the newly-formed United States, which relied heavily on the Mississippi River for transportation of goods. The Mississippi River was eventually reopened to U.S. shipping through the Pinckney's Treaty in 1795.