With these plummeting birthrates and the migrant / jogger problem, incest is actually a viable option.
Trump might have to take one for the team.
Increasing White birth rates. The Royals pull it off just fine. Still gotta be careful about it. Can't do it for like 2,000 years, but maybe a few generations just to get through.
Yeah, he is losing his soldiers because of it - like Alexander.
Wincest.
They way of the Greek Gods.