Question

the gulf of mexico/gulf of america is most affected by which major river system?
missouri river
hudson river
colorado river
mississippi river

Explanation:

The Mississippi River flows into the Gulf of Mexico. It has a large drainage basin and carries significant sediment and water into the gulf, having a major impact on its ecosystem, water flow, and sedimentation patterns. The Missouri River is a tributary of the Mississippi. The Hudson River flows into the Atlantic Ocean near New York. The Colorado River flows into the Gulf of California (Sea of Cortez), not the Gulf of Mexico.

Answer:

Mississippi River