Question

In the late 1800s, which concept was used to

Answer 1

Answer; 
3) Social Darwinism

Explanation;
Social Darwinism merged Charles Darwin's theory of natural selection and Herbert Spencer's sociological theories to justify imperialism, racism, and social and economic policies. 
the ideas of Social Darwinism pervaded many aspects of American society in the Gilded Age, including policies that affected immigration, imperialism and public health.

Answer 2

3; social Darwinism explains that the wealthy has justly accumulated their riches. This was a justification for "conspicuous consumption," which was when the rich would flaunt their wealth.