(A) The Civil War
(B) ** The Spanish-American War
(C) World War I
(D) World War II
EXPLANATIONS BELOW
Concept note-1: -American Imperialism: The Spanish-American War.
Concept note-2: -Thus, the war enabled the United States to establish its predominance in the Caribbean region and to pursue its strategic and economic interests in Asia.
Concept note-3: -Background. In the late 19th century various large and powerful nations entered a phase of territorial expansion often called the second great era of imperialism. Britain, France, Germany, the United States and others sought new colonies and zones of influence for commercial, military and religious reasons.
Concept note-4: -Imperialism is the state policy, practice, or advocacy of extending power and dominion, especially by direct territorial acquisition or by gaining political and economic control of other areas, often through employing hard power (economic and military power), but also soft power (cultural and diplomatic power).