Did the strategy of "attrition through enforcement" work? In this paper, the author seeks to determine whether restrictive state-level immigration laws passed between 2005 and 2010 succeeded in reducing the size of the undocumented and general immigrant population in those states. According to the author, this study is "among the first to examine whether immigrants react to such laws by leaving or remaining."  Of the 868 immigration laws reviewed by the author, 441 were classified as restrictive, 423 were immigrant-friendly, and 4 were neutral.  The states that enacted the most restrictive laws were Arizona, Colorado,Georgia, Utah, Virginia, and Tennessee, with more than 20 each. In addition to demographic data for these states, the author also