“We have never dreamt of incorporating into the Union any but the Caucasian race—the free white race,” he insisted on the Senate floor. “Are we to associate with ourselves, as equals, companions, and fellow-citizens, the Indians and mixed races of Mexico?” Apparently not. The United States annexed the thinly populated northern part of Mexico (including present-day California, Utah, New Mexico, and Arizona) but let the populous southern part go. This carefully drawn border gave the United States, as one newspaper put it, “all the territory of value that we can get without taking the people.”
