What led to the development of the colonization movement in the late eighteenth and early nineteenth century?

The migration of African Americans to other lands in search of freedom during the late eighteenth and nineteenth centuries was an expression of their belief that they would never achieve a position of true equality in the United States. The only solution to this problem, they felt, was to establish separate, self-governing societies or nations. Though migrants found their way to Canada, Haiti, the West Indies, and Mexico, Africa was, most often, the refuge of choice. Emigration and colonization were controversial within the African-American community, and some of the consequences of these migrations were negative for the receiving populations.

The mountains on the east would be taller