The question has never really been whether or not the American state could or would force anyone to do anything. Of course it can. Of course it will. That's what everyone from the very beginning has always known. Just read Washington or Jefferson or Hamilton.
The key to the success of the American Government, rather, has instead been in the myriad ways in which it's been able to convince itself and its believers that the use of force is perfectly right and good.
Once you cross that line, then means and opportunity are all that remains as an impediment to using it anywhere and everywhere. Rationalizations can always be found, and always will be.