Why did liberia get colonized?

Liberia was not a colony in the traditional sense as it did not have a foreign state to which it was dependent, but it was founded by foreigners, specifically African-Americans leaving the United States. Liberia was designed as an African-American colony because there were some African-Americans who believed that they could only realize their full potential in Africa. Of course, upon going there, they discovered that they were culturally very different from the Africans there and were much more Western in their outlook.