Why did Spain close the mouth of the Mississippi River to American shipping?

a. Americans had refused to pay a tax for using the river
b. The river was deemed too dangerous for shipping vessels to navigate safely
c. Native Americans had declared the river sacred and convinced the Spanish to block all commercial boats from entering
d. Spain was concerned that Americans would eventually try to take the region from them
e. The river was too shallow for the large shipping vessels Americans were using

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Disclaimer: This question is just for testing your knowledge of AP US History… it is not intended to be a “sample question” from the AP US History Exam! That’s what APUSH practice tests are for.

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