One hundred years ago this fall, the Supreme Court decided Euclid v. Ambler Realty and handed American cities the legal machinery to separate everything from everything else. Homes here, shops there, schools over there, workplaces over here — and you had to drive between all of them. I bring up the anniversary because it frames the moment we're in. The regulatory order Euclid set in motion took decades to assemble. It's now being reformed in a meaningful way — and single-stai