What were two reasons that some settlers traveled into the Ohio river valley by flatboat instead of wagon?

Affordability: Flatboats were a more affordable option for many settlers than wagons. Wagons were expensive to purchase and maintain, and required teams of horses or oxen to pull them. Flatboats, on the other hand, could be built using relatively inexpensive materials, and required only a few people to operate them.

Speed and accessibility: Flatboats could travel faster than wagons, and could be used to reach areas that were not accessible by land. The Ohio River and its tributaries provided a convenient and direct route into the Ohio River Valley, allowing settlers to quickly and easily reach their destination.