Answer :

The European nations used theories developed by Social Darwinists to justify expansion in Africa and Asia.

1. Social Darwinism was a theory that applied Charles Darwin's principles of natural selection and survival of the fittest to human societies.

2. Social Darwinists believed that some races or nations were superior to others and that it was natural for them to dominate or colonize "weaker" nations.

3. They argued that European expansion into Africa and Asia was a way to spread civilization, modernize societies, and uplift the "less developed" populations.

4. By using Social Darwinist ideas, European powers sought to legitimize their imperialistic ambitions and justify their actions in the eyes of the public and policymakers.