Manifest Destiny was a 19th century belief that the United States was destined to expand from coast to coast. It was used to justify the acquisition of territories in the West and South. Supporters believed it was ordained by God and would spread American ideals of liberty, democracy, and individualism. Critics argued it was used to justify the removal of Native Americans and expansion of slavery. Political parties differed in their support, with Democrats generally in favor and Whigs opposed.