The Census Bureau’s holiday treat is its release of annual state population estimates, to be digested slowly in the new year. The headline from this year’s release is that population growth from July 2012 to July 2013 was 0.72 percent, lower than in the two preceding years and the lowest since the Great Depression 1930s. This reflects continuing low, below-replacement-rate birth rates and lower immigration than in 1982-2007. Net immigration from Mexico evidently continues to be zero. The nation's economy may be growing again, but Americans -- and potential Americans -- are not acting like it. There's a parallel here...