Are you sure that you have never looked at a weather forecast (or received a severe weather warning), crossed an ocean in an airplane, used GPS (or another satellite-based navigation system, or eaten food farmed using precision automated equipment that does), which are just the first things coming to mind that would be much harder without satellites?

Do you really think people will want to go to war to protect America's hegemony of gps?

I believe the US would almost certainly go to war if there were an intentional attack on GPS.

The us goes to war if someone sneezes.