Modes of transportation in the United States improved significantly during the early to mid-1800s with the building of canals, roads, and railroads, as well as greater utilization of rivers. This transportation revolution made it possible to more easily transport goods, resources, and people across the growing nation and expanding frontier, enabling further economic development and westward expansion. Key developments included the Cumberland Road, Erie Canal, early steam engines applied to railroads, and Robert Fulton's successful first steamboat trip in 1807. With these advancements, interregional trade increased and regions grew more interconnected and dependent on one another.