Answer:
One reason the U.S. became an imperialist nation at the turn of the twentieth century was to expand its markets and gain access to raw materials to fuel its growing industries. The U.S. also sought to project its power and influence globally to establish itself as a major world power. To achieve its imperialist goals, the U.S. used its economic power by establishing spheres of influence and open-door policies in regions like China, which allowed American companies to operate there with minimal restrictions. The U.S. also used its military power to forcibly acquire territories like Hawaii and the Philippines and to intervene in conflicts like the Spanish-American War to protect American interests.