Steamboats are boats that are powered by steam engines, which use steam to drive paddles or propellers. They became popular in the early 19th century, especially in the United States, where they were used for transporting goods and passengers along rivers like the Mississippi River. The invention of the steamboat revolutionized travel and trade, making it faster and more efficient. The first successful steamboat was the Clermont, built by Robert Fulton in 1807. Steamboats played a crucial role in the expansion of the American frontier, allowing people to travel and settle in new areas. They also contributed to the growth of cities along rivers, as they facilitated commerce and communication.