Liberia is a country of @ 4million people. Monrovia is its major/capital city with about 1/10 of the country’s population. I don’t know that it’s ever been an international hub of travel. It has very few flights in and out to the West. And as far as I know, you can’t get a non-stop (or even one-stop) between Monrovia and New York.
Liberia was just starting to recover from its civil war. God only knows how it will overcome this Ebola situation.
I’ve seen other people post that there were direct flights from Monrovia to the US. I did a search and could only find flights through Brussels. Not a major improvement.