The earliest starting point for Current Year I can think of is about 2011 with Occupy and SJWs taking hold and really becoming noticeable on Tumblr. They started becoming visible as they are now on campuses around 2013. They'd been around for a while (my dad was at Ohio State in the early 80s and was in an urban planning class and some feminist got triggered at "manhole"). But not quite this loud, crazy, and numerous.
As for how we got here:
As for how we got here: