The US was invoking which principle when intervening in the Mexican Revolution? A. Dollar Diplomacy
B. Roosevelt Corollary
C. Truman Doctrine
D. Open Door Policy

a countries leader should be motivated by the common good of the country.

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.