The term “frontier” in literature has been used both literally as a physical boundary and metaphorically to evoke transitions, conflicts, and cultural encounters. Various writers describe the frontier as a place of both danger and opportunity: Mooney portrays it as a contested region where Cherokee joined British forces [1], while Marco Polo narrates the borders of empires and the clash of civilizations, such as the eastern frontier bordering Kashgar [2] and the Manchu frontier [3]. In military discourse, strategists like Jomini illustrate its critical role in defense and operations, emphasizing how a capital’s proximity to the frontier could decide the outcome of wars [4][5][6]. Moreover, authors such as Shaw poetically remark on the frontier as a conceptual shift—“only the difference between two ways of looking at things” [7]—demonstrating its layered meanings that extend beyond mere geography. Through such diverse representations, “frontier” remains a potent symbol of both physical and ideological boundaries in literature.