Most US history textbooks contain a familiar map: shaded colors stretch across North America, clearly and neatly demarcating the extent of US expansion from 1776 thru the late nineteenth century. In The Age of the Borderlands: Indians, Slaves, and the Limits of Manifest Destiny (UNC Press, 2025), University of Kansas distinguished historian Andrew Isenberg asks us to rethink the clean lines and simple borders of the North American past. By examining the stories of escaped enslaved people, Christian missionaries, government vaccination campaigns, anti-slavery schemes, and even well worn historical events like Lewis and Clark and the Lousiana Purchase, Isenberg shows that American power at its borders fell far short of expectations in Washington, and often doesn't match up to historical interpretations in our present day. Rather, American hegemony in the borderlands was contingent, weak, and anything but assured, until well into the nineteenth century. Rather than Manifest Destiny, Isenberg argues that American expansion both west and south should be viewed as one of just many possible outcomes of the boisterous mess that was early North American politics. 

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