Social Darwinism
Social Darwinism led directly to racism and xenophobia and expressed itself radically during the first half of the 20th century in various eugenicist theses.
Imperialism
Imperialism was a way to promote the cheapening of production and the expansion of profits of the world powers, ensuring economic development.
basis of US imperialism
The basis of US imperialism was the Big Stick, which consisted of interventions in the economy and politics of American countries, exerting hegemony over the region.