Some abolitionists and enslaved African Americans distrusted the American colonization society and their goals differed from that of the ACS.
Step-by-step explanation:
Differences of opinion existed among the people of US regarding the grant of citizenship to former slaves. Some thought they would be better off in Africa which is their birthplace where they will be free from racial discrimination. But some believed that they should be allowed to stay back in the US as free citizens.
American Colonization Society was formed in 1817 to transport free blacks to Africa. A colony was formed in the west coast of Africa. This later became the nation Liberia. Anti-slavery advocates thought that this approach is not progressive and the intent of the move was the retention of slavery.
The ACS slowly declined faced by the oppositions after 1840.