Answer:
Social Darwinism.
Step-by-step explanation:
Imperialists often used Social Darwinism in order to justify imperialism in the eighteenth and nineteenth century. Colonizers from European countries and North America commonly justify imperialism by claiming that they were making the people civilized during their colonization period. Racism was a prominent ideology used by the European countries to govern people in the American colonies. Almost all the colonized societies defend their lands against colonization through fighting of war.