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638 Chapter 22 | Age of Empire: American Foreign Policy, 1890-1914
Figure 22.4 Historian Fredrick Jackson Turner’s Frontier Thesis stated explicitly that the existence of the western frontier forged the very basis of the American identity.
Although there was no more room for these forces to proceed domestically, they would continue to find an outlet on the international stage. Turner concluded that “the demands for a vigorous foreign policy, for an interoceanic canal, for a revival of our power upon our seas, and for the extension of American influence to outlying islands and adjoining countries are indications that the forces [of expansion] will continue.” Such policies would permit Americans to find new markets. Also mindful of the mitigating influence of a frontier—in terms of easing pressure from increased immigration and population expansion in the eastern and midwestern United States—he encouraged new outlets for further population growth, whether as lands for further American settlement or to accommodate more immigrants. Turner’s thesis was enormously influential at the time but has subsequently been widely criticized by historians. Specifically, the thesis underscores the pervasive racism and disregard for the indigenous communities, cultures, and individuals in the American borderlands and beyond.
While Turner provided the idea for an empire, Mahan provided the more practical guide. In his 1890 work, The Influence of Seapower upon History, he suggested three strategies that would assist the United States in both constructing and maintaining an empire. First, noting the sad state of the U.S. Navy, he called for the government to build a stronger, more powerful version. Second, he suggested establishing a network of naval bases to fuel this expanding fleet. Seward’s previous acquisition of the Midway Islands served this purpose by providing an essential naval coaling station, which was vital, as the limited reach of steamships and their dependence on coal made naval coaling stations imperative for increasing the navy’s geographic reach. Future acquisitions in the Pacific and Caribbean increased this naval supply network (Figure 22.5). Finally, Mahan urged the future construction of a canal across the isthmus of Central America, which
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