Homestead Act: This act offered cheap land (usually 160 acres) to settlers who agreed to develop and improve it within a specified time period.
Manifest Destiny: Manifest Destiny was the belief that it was America's destiny to expand its territory from coast to coast, which played a significant role in promoting western expansion.
Transcontinental Railroad: The construction of the transcontinental railroad facilitated western expansion by providing faster and more efficient transportation across the country.