Final answer:
The American Colonization Society (ACS) was opposed by various groups including northern free black Americans, middle-class evangelicals, and abolitionists like William Lloyd Garrison.
Step-by-step explanation:
The American Colonization Society (ACS) was a controversial organization that sought to colonize free Black people in Africa. While leading statesmen like Thomas Jefferson supported colonization, there were many people who disliked the ACS and its goals. Some of the people who opposed the ACS included northern free black Americans, middle-class evangelicals, and abolitionists like William Lloyd Garrison. These individuals believed in the rights and equality of all people and saw colonization as an unjust solution to the issue of slavery.