This is a fantastic video explaining how we got to this point. It starts with an explanation of what communism is, goes through why communism is so bad, and then delves into some of the major players and groups (Gramsci, Alinsky, Fabian Socialists, etc etc.) and how they have had detailed plans that they have followed for 60 years now and have recently completed almost all their goals. Thanks for posting about the Agenda video. You're right...it's a fantastic explanation of how we got here. It's available for free at this link.
It teaches the history they won't teach in our public schools.