(A) invention of the wireless telegraph
(B) negotiation of a military alliance
(C) expansion of nationalist movements
(D) ** improvements in sea transportation
EXPLANATIONS BELOW
Concept note-1: -The Panama Canal is a constructed waterway that connects the Atlantic and Pacific oceans across the Isthmus of Panama.
Concept note-2: -They controlled the islands to use them as refueling and repair stations for naval vessels.
Concept note-3: -The growing production of the country demands it.” The main idea of this statement by Alfred T. Mahan is probably that. the United States must look abroad to find new markets for its products. It is a fact rather than an opinion that. The United States acquired new territory after the Spanish-American War.