Why did Americans need to use the Mississippi River and New Orleans?

Because New Orleans was a very important trading port. ... The New Orleans was very important for importing and exporting goods;Mississippi River was a major transportation for settlers and good to ship items east.

Explanation:

Why did Americans depend on the Mississippi River and access to New Orleans? New Orleans was a port that was very busy with settlers and traders with expensive furs and very important.

necessary and proper clause. the congress shall have power to all laws which shall be necessary and proper for carrying into execution the foregoing powers, and all other powers vested by this constitution in the government of the united states, or in any department or officer thereof.

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