Westward Expansion, a pivotal period in American history, refers to the territorial expansion of the United States towards the western regions during the 19th century. This significant movement played a crucial role in shaping the nation and laying the foundation for its development into a world power. The motivations behind Westward Expansion were diverse and intertwined, including economic opportunities, the belief in American exceptionalism, and the fulfillment of Manifest Destiny.

One of the key events leading up to Westward Expansion was the Louisiana Purchase in 1803. This monumental acquisition from France nearly doubled the size of the United States, opening up vast territories for exploration and settlement. It provided the opportunity for further westward exploration, as evidenced by the Lewis and Clark expedition commissioned by President Thomas Jefferson. The expedition, which commenced in 1804, aimed to explore and survey the newly acquired land, establish peaceful relations with Native American tribes, and seek out potential trade routes.

Westward Expansion had far-reaching impacts, both positive and negative, on various aspects of American society. It facilitated the expansion of agriculture, trade, and commerce, leading to the growth of new towns and cities. However, it also resulted in the displacement and mistreatment of Native American tribes, forging a legacy of broken treaties and conflict.