Countries way poorer and way less technologically advanced than the US have managed to contain this outbreak.
The US isn't trying seriously.
I don't like this binary thinking, a more serious effort can and will save lives, I don't know how many, but giving up because it's not going to stop all infections is a mistake I think.
I would say that as a whole most countries do not have a hold on it, other than maybe China. Unless you test everyone you have no way of knowing how widespread the outbreak is, especially since it's sometimes mild. Community infections are happening in lots of countries that weren't from travelers from infected areas. Also the CDC is absolute trash so containment is gonna be on a state by state basis, and they don't always talk enough to each other