I could see an increase in terrorism by white separatist/supremist groups, although I think some of the potential terrorism will have less to do with race and more to do with pushback against an authoritarian state.
For example, 3 percenters and the Oath Keepers are often painted as white supremist, but in reality, they're more about retaining gun rights and fighting overreach by government. I could also see them specifically targeting antifa, because local authorities aren't doing anything about their violence. In Portland, for example, they're letting antifa get away with all kinds of crap.