What was the main objective of the Lewis and Clark expedition?

The primary objective of the Lewis and Clark expedition was to explore the newly acquired western territory following the Louisiana Purchase and to find a practical route to the Pacific Ocean. Commissioned by President Thomas Jefferson in 1804, the expedition aimed to map the vast landscapes of the west, gather scientific data, and establish American presence in this expansive region. The outcome of their journey significantly contributed to the understanding of the geography, natural resources, and peoples of the western United States, thereby laying the groundwork for future exploration and expansion.

While establishing trade with Native Americans and negotiating treaties were important aspects of American expansionism, these were not the central goals of the expedition. Mapping the Great Lakes and negotiating with Spain focused on different geopolitical areas and contexts, which did not align with the main aspirations of Lewis and Clark's journey. The expedition's successful navigation and documentation helped facilitate further U.S. exploration and settlement, emphasizing its essential role in American history.