That which sustained all throughout the 30 Years War, the 100 Years War, the ___ Wars ...ad nauseum ad infinitum and --> ongoing.. through the perpetual adolescence of homo non compos mentis.
There is No Place in the (This!) World for *Just One* Superpower! as your Yin/Yang simile wisely reminds. And at the present rate of accidental contretemps - there *Will* be an opposition coalition created.. eventually.. to counter our unsustainable hegemony \ufffdber alles. Microsloth is what you get, with *Just One* of ANYTHING. (And with an Ashcroftian/Billyan at the helm)
'Balance' or.. Worldwide Dystopia via (virtual) Dictat. We are dumb enough collectively - maybe?? - that either is a possible fork, in some next: depending IMhO on just how long we can keep it in the pants. Period. One Nuke next: can ruin Your Whole \ufffdon.
Ashton