[Propertarian]

I don't think that we should think of it as something that is simply ended when it goes on for a long time or gets too bad. In the 1870s blacks were as opressed as they were in 1950s, and there wasn't really any reason to think that some end point was in sight.

We also need to consider how likely it is that the opression will be ended; people need hope that a social movement will occur or be sucessful before engaging in one/starting one.