Social Darwinism:

After Darwin, philosophers such as Herbert Spencer in England included society as part of the environment that humans adapted to, and social survival belonged to the “fittest”—those who adapted best. This was initially to address the issue of the urban poor and to block government welfare programs.

Continuing with the idea of lineal progress, Darwin’s division of humans into stages of development paved the way for a universal common historical path for all societies. It paved the way for the 20th century slogan of modernization.