I don't know, but I think we may have at one time.
The same problem still remains with nuclear ABM actually. Unless the neutron/gamma flux manages to kill the incoming vehicle (and most such vehicles are pretty hard by nature), the nuclear explosion does not have the velocity or dwell time to have much of a chance of killing a hypersonic projectile.
Note that this is why most of our next generation weapons are hyperkinetic: no conceivable armor will withstand them, they deliver many times more energy on target than explosives, the time-to-target is insanely short, the range is unusually long, and the only way to stop them is kinetic intercept -- a difficult technology that we've developed into a fine art. The US having a hyperkinetic weapons platform and broad kinetic intercept capability will put its military on a qualitatively different plane of conventional warfare than any other military as it will effectively obsolete all current military technologies, including the ones used by the US.
We have an "open society", or as some like me say, a very ignorant society. Certainly, we have very ignorant leaders. As we speak, there are still Chinese roaming around the Los Alamos nuclear facility. Any technology we develop is quickly stolen and our enemies get it almost instantaneously. The Chinese have a better spy system than the Soviet Union ever had. The United States "leaders" (I almost puke when I say the word "leaders"), refuse to have an anti-spy, counter intelligence system capable of stopping enemy spying.
It is foolish to state that the USA will ever have any superiority in any military technology, since we give it away, sell it for votes (a la Scumbag and Gore with the Chicoms), or allow enemy spies to just walk away with it unfettered.