(A) ** the end of the frontier in the US
(B) ** desire to compete against European empires
(C) the need for more workers in the industrial age
(D) ** the need for new markets and more natural resources
EXPLANATIONS BELOW
Concept note-1: -Imperialism is when a country extends its power into other territories for economic or political gain. The goal of imperialism is to acquire resources, often through exploitation and force. Motives for imperialism include economic, cultural, political, moral, and exploratory control.
Concept note-2: -This New Imperialist Age gained its impetus from economic, military, political, humanitar-ian, and religious reasons, as well as from the development and acceptance of a new theory-Social Darwinism-and advances in technology.
Concept note-3: -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-4: -Imperialism results from a complex of causes in which in varying degrees economic pressures, human aggressiveness and greed, the search for security, the drive for power and prestige, nationalist emotions, humanitarianism, and many other factors are effective.