I'm starting to see why America hasn't won a war in like 100 years.

Because they've come to the conclusion they don't have to, and that plunging entire world regions into chaos is enough to secure their hegemony. When you've lost Korea and Vietnam and Iraq and Afghanistan and are still on top, you start to think "it doesn't matter, we just have to fuck shit up and it'll work in our favor". Amerika doesn't need all of Ukraine, they've already written off the losses. They've already gotten at least a decade worth of wartime production for the entire IMC of the Western world out of this, they've ended cheap Russian gas for their European allies-hostages-competitors and replaced some of the supply with their own gas shipments, they'll ultimately have a greater Eastern European sphere of influence than ever before, their stay behind nazi sleeper cells get free refills on military hardware and actual combat experience if they want to and Blackrock is buying finest Ukrainian farmland at bargain bin prices. A military victory where Russia doesn't get Crimea, Donbass and Luhansk means fucking nothing compared to all that, it'd be the cherry on top but it doesn't truly matter when all the other stuff is secure.