Whether we like it or not, a strong U.S.A helps to keep some semblance of control on China, Russia and all the other ‘bad’ actors of the world. Without the U.S.A, Europe may not have won World War 1 and it definitely wouldn’t have won World War 2. Everyone’s lives have hung by tiny threads of history.
Any kind of major insurrection or,God forbid Civil War will weaken America and allow those naughty countries to pounce and expand their spheres of influence.
If you don’t believe that is their agenda, consider the Crimea, Eastern Ukraine, Hong Kong and Taiwan. And then there’s the Chinese takeover of the entire South China Sea to the chagrin of many other nations.