The main purpose of the westward expansion in the United States was to explore and settle new territories, acquire natural resources, establish trade routes, and extend the political and economic influence of the United States across the continent. Additionally, it was driven by the belief in Manifest Destiny, the idea that it was America's destiny and duty to expand westward and spread democratic ideals and civilization. The westward expansion also provided opportunities for economic growth and land ownership for settlers, as well as the expansion of the agricultural economy.
