CLEP US History 1 Practice Test

The treaty that allowed the U.S. to use the Mississippi River and the port of New Orleans is Pinckney's Treaty, signed in 1795. This agreement was crucial for the burgeoning United States as it facilitated free navigation on the Mississippi River, which was vital for trade and transportation for western farmers and merchants. Additionally, it granted access to the important port of New Orleans, allowing American goods to be shipped to international markets more efficiently.

Pinckney's Treaty also established a clear boundary between the U.S. and Spanish territories, which was significant for the expansion and security of the young nation. The treaty was part of the broader efforts of the U.S. government to foster peaceful relations with Spain, which had territorial claims in North America and was a critical player in the region during that period. This arrangement contributed to the economic growth and westward expansion of the United States. The other treaties mentioned do not pertain to the navigation rights and access to New Orleans specifically.