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Yesterday was the 20th anniversary of welfare reform, a law that profoundly changed the nature of public assistance in America. While its liberal critics worst predictions may not have come true, the reform’s legacy has nonetheless diminished after decades of careful study. There are even good reasons for conservatives to feel ambivalent. On the one hand, welfare reform eliminated an entitlement (AFDC) and replaced it with TANF, a block grant to states that added work requirements to cash welfare and caused caseloads to plummet. It…