The two vital rivers of the western and southern boundaries belonging to Northwest territory would be:
- Mississippi, and Ohio river
- The Mississippi River is categorized as the 'central river that flows from north-central Minnesota into the Gulf of Mexico.'
- It is also categorized as the North American Continent's second-largest river.
- While Ohio is the river in the United States that flows 981 miles from the confluence of the Allegheny and Monongahela at Mississippi.
- That latter flows into the Mississippi at Cairo, Illinois.
Thus, Mississippi and Ohio are the correct answers.
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