It is no mistake that when the US, Soviet Union collapsed it sent ripples through the entire world. Even though the United States was victorious in the Cold War over the Soviets, it collapsed violently with the Russians, both balkanizing.
The world after that adjusted with many nations such as the PRC adjusting, changing because of the massive power vacuum left by the United States-Soviet Union collapse. But their is no doubt that Europe and China are the worlds powers.
So what if we could prevent the collapse of the US? After all it was victorious in the Cold War?
How would the world be different if we can prevent it?