The last post explained how to use QGIS and historic census data to map population density. This post gets to that tricky “so what?” question.
So why map population density in 1800? My current project examines the social, cultural, and physical transformation of the American coast (my shorthand for coast of the United States of America) over the course of the long nineteenth century. I’m primarily interested in the oceanfront between ports, harbors, and the huge natural bays and sounds, that many a European explorer thought led to China, and how they became such a central—arguably essential—part of the American experience.
I’m currently slogging through the first chapter, a survey of the American coast on the eve of its transformation. It’s partly inspired by Marcus Rediker’s magisterial first chapter in Between the Devil and the Deep Blue Sea and similarly favors fruitful generalization over burdensome qualification. An important subargument of the chapter is to establish the 1800 American coast as a frontier. Well…maybe I do a bit of hair-splitting in the chapter. In any case, one of the many ways to define frontier is through population density. Hence, our maps.