About eighty years ago, the US assembled the top minds of nuclear physics, and the US military knew the potential of creating a weapon out of physics, then BOMB. Now the situation is the same, it's reasonable to think the US is the most advanced nation in cyber weaponary.
Things were different in the era immediately after WW2 and now. Power and wealth is distributed amongst more countries now. The US cannot do much with the Taiwan situation for example.
