How did the pacific railroad act the united states expand westward?

The Homestead Act and the Pacific Railway Act helped lead to the defeat of many Native American tribes in the West. When white Americans began to expand westward between 1820-1850, they encountered numerous Native American tribes east of the Mississippi River. Many white Americans viewed these tribes as obstacles to progress. As a result, the United States government forced these tribes to move to lands located west of the Mississippi River.