I’m going to throw a little more fuel on the fire and suggest that RZ wasn’t a movement either. Zionism was a movement. Then there was the frum community’s reaction to that- those who embraced and applauded it (Mizrachi), and those who opposed it (Agudah et al). Meaning that the splinter in the frum world was based on Hashkafa and also the old standby, politics. The differences in the communities as they are now I think stem from that original stance- joining and working side-by-side with the secular Zionists to build the state, or fortifying the community against the outside influences of the secular builders of the state.
Now feel free to discuss, dissect and disagree….