In June 2012, the U.S. Supreme Court struck down large parts of an Arizona state law intended to give local law enforcement the power to enforce federal immigration laws. The ruling in Arizona v. United States held that three sections of S.B. 1070 were pre-empted by federal immigration law. The Obama administration, which opposed the Arizona law, along with advocates for open borders, hailed the ruling, contending that the U.S. couldnÂ’t very well have 50 different immigration policies. Now, five years later the script has flipped. Many of the same folks who railed against a single state setting its own...