society > society and the community > dissent > be in dissension or at variance [verb (intransitive)] > become disunited (3)
intransitive. To make or cause a breach; to quarrel, separate. Obsolete.
Chiefly with into. intransitive. Of a group or groups of people: to divide into subsidiary groups; esp. to split into factions; to splinter.
To break up into factions, sects, or similar divisions; to separate through disagreement or difference of opinion; to fall out or disagree.