The population charts (http://usafacts.org/us-population http://usafacts.org/us-population) are interesting. It looks like the government continually underestim

The population charts (http://usafacts.org/us-population http://usafacts.org/us-population) are interesting. It looks like the government continually underestimated the population, resulting in the "spikes" as each Census brought numbers up toward reality