Dd: de jure

Adverb

according to law [Latin]

Collins Essential English Dictionary 2nd Edition 2006 © HarperCollins Publishers 2004, 2006

In Context:
Buchanan could not force whites to live in the same neighborhood as blacks," Bernstein and Somin write, "but it did prevent cities from stifling black migration by creating de jure and inflexible boundaries for black neighborhoods, and may have prevented even more damaging legislation.

When bigots become reformers: the Progressive Era's shameful record ... by Root, Damon W. / Reason