What is ONE example of a regional, religious, or ethnic movement that challenged colonial rule and imperial boundaries after 1900.

definitely a for sure. ill see and update if i get the answer

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.

c, because the american revolution was from 1765 to 1783.