The colonial romances of the Southern writer William Gilmore Simms embody the Americanness with racial tolerance and a comparatively authentic Indianness instead of Americanism with strong racist overtones. Simms represents the mutual influence and interaction of Americanness and Indianness through the relationship between the white people and the Native Americans. Under his prospective and romantic writing, Americanness erodes Indianness on one hand and the two coexists with each other on the other, which becomes an useful exploration for the writer to construct an ideal social order in America.