Why did the Louis and clark expedition start in St. Louis?

The Lewis and Clark Expedition began in St. Louis because it served as a key transportation hub and gateway to the western frontier during the early 19th century. Located at the confluence of the Mississippi and Missouri Rivers, St. Louis provided access to vital waterways for the journey. Additionally, it was a center for commerce and supplies, making it a practical starting point for the expedition aimed at exploring the newly acquired Louisiana Territory and finding a route to the Pacific Ocean.