(A) ** American sought new territories in which to expand.
(B) The rising American population needed more room to expand.
(C) Social Darwinism called for displaced Native Americans to be resettled in Europe.
(D) The success of “Manifest Destiny” encouraged imperialist ambitions.
EXPLANATIONS BELOW
Concept note-1: -The closing of the western frontier affected American imperialism because it led to Americans looking beyond its borders and North America for resources and markets.
Concept note-2: -Both a desire for new markets for its industrial products and a belief in the racial and cultural superiority of Americans motivated the United States’ imperial mission.
Concept note-3: -The closing of the frontier cause a reduction in individualism. The federal government gained more control over the direction of the nation. On the frontier people had to depend on themselves and their neighbors. With the closing of the frontier people had more reliance on assistance of government.