which of the early north american cultures were known as the canal builders?
a. the hohokam
b. the adena
c. the hopewell
d. the anasazi

The answer is a the Hohokam.

its main object was the establishment of "settlement houses" in poor urban areas, in which volunteer middle-class "settlement workers" would live, hoping to share knowledge and culture with, and alleviate the poverty of, their low-income neighbors.