The idea that European races were superior to others and imperial domination was nature's way of improving the human species was found in the theory of

Social Darwinism

Explanation:

Social Darwinism is a loose set of ideologies that emerged in the late 1800s in which Charles Darwin’s theory of evolution by natural selection was used to justify certain political, social, or economic views. Social Darwinists believe in “survival of the fittest”—the idea that certain people become powerful in society because they are innately better. Social Darwinism has been used to justify imperialism, racism, eugenics and social inequality at various times over the past century and a half.

the answer to your question is:

strong-mayor system

b

explanation: