Nearly 50 per cent of American states have altered their rules against perpetuities. But not all the regimes are equally advantageous to settlors. This article provides an overview. Problems and Promise of Perpetual Trust Laws by Daniel G Worthington was originally published in the December 2004 issue of Trusts & Estates and is reprinted here with the kind consent of the author and the group publisher, Rich Santos, of Trust & Estates, Primedia, New York.