The 2010 census shows America’s population growth dropping to the lowest level since the Great Depression, with a steady migration of people to the South and West. The shift will be a boon to Republicans as GOP-leaning states such as Texas pick up new House seats.
Source: http://www.npr.org/2010/12/21/132234651/census-data-will-reshape-u-s-political-landscape?ft=1&f=1003