Well, it's not really any one thing. It's more the general sets of policies & ideologies that the various parts of our political spectrum hold, looked at from a

Well, it's not really any one thing. It's more the general sets of policies & ideologies that the various parts of our political spectrum hold, looked at from an objective (or at least more global) point of view. Additionally, I did specifically mention that, at the same time as this has been going on, a second movement has been underway that counterbalances it to some extent, and that this is resulting in unprecedented(?) levels of political polarization.