Final answer:
The Anti-Imperialist League is the group that best fits the definition
Step-by-step explanation:
The word from the list that best fits the definition of a group made up of Americans who opposed the peace treaty between the United States and Spain is Anti-Imperialist League. The Anti-Imperialist League was formed in the United States in 1898 to oppose American expansion overseas and argued against the annexation of the Philippines.
Learn more about Opposition to the peace treaty between the United States and Spain