During the late 19th century and early 20th century, what doctrine was used to justify treating immigrants from different regions differently? a. Biblical theology b, Social Darwinism c. laissez-faire d. capitalism e. progressive imperialism

Social Darwinism was most likely applied to treat immigrants from different regions differently, however, Social Darwinism does not specifically relate to immigrants but also to all members of society. In the American context, the notion was implemented to popularize the notion of "survival of the fittest" or that the strongest members of a society will succeed and the political system should support this theory.