I think there should have been restrictions on people coming from that part of the world (West Africa), particularly Liberia and Sierra Leone. Halt travel to and from those countries (they’re not economically important) or make those travelers remain in quarantine. It wouldn’t have stopped it in the long run, since people would be evading security to get here overland, but it would have slowed it down.
The big hope is to develop a vaccine, because this is, after all, just a virus. But that takes time. So even delaying it is good.
It was tried. The African Union flew people to DC to complain how racist it was to steal money from poor African countries by enforcing a quarantine.
We are living in a mad world, were we court death in order to make sure the protected classes don’t get their feelings hurt.