There was a big push to enumerate the undocumented in the count, thus pushing up the total, and now with the passage of some onerous anti-immigration laws almost half a million of the reported 1.6 million total increase in population have left the state.
But we keep the extra seat.
Arizona will gain a ninth seat in Congress in 2012, a result of being the second fastest-growing state in the nation over the past decade, according to the first release of 2010 census data today.
Another factor in the lower population count was an array of measures cracking down on illegal immigration, beginning with passage of employer sanctions in 2007. The census counts all residents, not just American citizens and legal immigrants.
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http://www.azcentral.com/news/articles/2010/12/21/20101221arizona-census-results-mean-1-more-congress-seat.html#ixzz18mFDYSAd