America clearly wasn't using anywhere near all of the power it had
It wasn't sending every last teenager and pensioner to the front, like in the final defense of Berlin. But the simple fact is, it was throwing everything it reasonably could have at its optional colonial project, short of causing major instability for itself on the domestic front, or endangering its real (as opposed to imagined) security needs.
Until it was defeated in the way all the Western colonial powers were -- by simply being outlasted by the people that it had a delusional "need" to perpetually occupy.
It wasn't sending every last teenager and pensioner to the front, like in the final defense of Berlin. But the simple fact is, it was throwing everything it reasonably could have at its optional colonial project, short of causing major instability for itself on the domestic front, or endangering its real (as opposed to imagined) security needs.
Until it was defeated in the way all the Western colonial powers were -- by simply being outlasted by the people that it had a delusional "need" to perpetually occupy.
Neither is Russia now.
An equally unsupported belief.