They wont go to war because there is no reason to. This aint 1943...we dont fight wars for the glory anymore...we fight them to gain control of natural resources.
theres no money in the UN with out the US. the US needs all those countries. and all those countries need the US.
other UN countries know the US will have their back. they dont give a fuck about us US citizens, or our tax dollar. they just want big breh United States to have their back and protect their people from all the fuck ass rulers of these oppressed countries next door to them.
Canada and Mexico aint got no bullies by their other borders. But if Mexico and Canada got into an actual "war", the US would be fighting next to them, if they were asked. but since Canada and Mexico share borders with the US, America probably would involve them selves regardless.