Social & Communal Harmony

Maybe it's me, or what seems like perpetual election season, but little seems more relevant than reflecting on Social & Communal Harmony. What does the Buddha have to say about this, as one who lived through his own period of political upheaval and community division, and was insulted a fair amount? Let's pick up some of the Buddha's words and see what light they shine on how he was able to walk beneficially through this wild world.