It’s very obvious that 
is circling the drain now, but clearly this didn’t just happen in a vacuum. It must’ve started crumbling at some point… but when?
Some people might say it started after 9/11, others might say it goes back to the Raegan administration. A few might even say it started after losing the Vietnam War, or when they went off the gold standard. Or maybe even earlier…
What do you think? 
Partitioning would work I think, but the main point is the US breaking up independently is not really on the table for the rest of the world. It’s too unstable for other nations to do nothing. Imagine 4 or 5 new Israel’s all threatening to annihilate not only one another, but also any one of old Americas enemies? It’s not going to happen imho