Final answer:
Ohio is the state bordered by the Ohio River and home to the Cuyahoga, Miami, Muskingum, Maumee, and Scioto Rivers. It has historical significance as it marked a division between free and slave states and experienced severe environmental issues in 1969 when the Cuyahoga River caught fire.
Step-by-step explanation:
The state you're asking about, with the Ohio River acting as a natural boundary to West Virginia and Kentucky, and containing the Cuyahoga River, Miami River, Muskingum River, Maumee River, and Scioto River, is Ohio. In terms of historical geography, the Ohio River Valley was significant, as it became an early dividing line between North and South, with free states like Ohio, Indiana, and Illinois on its northern banks. Regarding environmental issues, in 1969, the Cuyahoga River in Ohio caught national attention when it was so polluted that it infamously caught fire, highlighting the severe environmental problems of the era.