The U.S. acquires a vast territory from France, setting the stage for westward expansion.

The U.S. government forcibly relocates Native American tribes from their ancestral lands to Indian Territory (present-day Oklahoma).

The U.S. gains control of a significant amount of land, including present-day California, Arizona, New Mexico, Texas, and parts of Colorado, Kansas, Oklahoma, and Wyoming.

The U.S. government engages in various conflicts with Native American tribes, including the Sioux Wars, leading to the forced assimilation and relocation of many Native Americans.