I'm not sure if you're aware, but the U.S. military is so formidable, it can fight three simultaneous full-blown Congressionally declared wars across the globe using only its carrier strike groups, and not even put a dent on its economy.

I don't know what could happen if they involved their Army or Air Force in a combined arms scenario.

So to answer your question, dismally depressing the U.S. can indeed not need to finish its Ukraine and Israel and still fight everywhere because it's not even formally declared war in either region with any faction and not even utilising a small fraction of its military might, economy or brainpower.