The Ohio Valley is a region in the United States that encompasses parts of several states, including Ohio, Indiana, Kentucky, West Virginia, and Pennsylvania. It is defined by the course of the Ohio River, which flows through the area and serves as a natural boundary. The valley is known for its fertile land, making it an important agricultural area. Historically, the Ohio Valley played a significant role in the westward expansion of the United States. It was a key area for early settlers and traders, and it became a focal point during the French and Indian War and the American Revolution. Today, the region is home to diverse communities and industries.