Tracking westward movement of U.S. population

Cool interactive graphic from the Census Bureau. As of 2010, the center of the population is near Plato, Mo. Link includes a short video. Some background:

Historically, the center of population has followed a trail that reflects the sweep of the nation's brush stroke across America's population canvas. The sweep reflects the settling of the frontier, waves of immigration and the migration west and south. Since 1790, the location has moved in a westerly, then a more southerly pattern. In 2000, the new center of population was more than 1,000 miles from the first center in 1790, which was near Chestertown, Md.