What is Manifest Destiny?

Manifest destiny was a widely held cultural belief in the 19th-century United States that American settlers were destined to expand across North America.

Manifest destiny was a widely held cultural belief in the 19th-century United States that American settlers were destined to expand across North America, the 19th-century doctrine or belief that the expansion of the US throughout the American continents was both justified and inevitable.  

this act gave the federal government the power to relocate any native in the east to territory west of the mississippi river.