“can we go to war against Mexico?”
Actually we should go to war with Mexico, take over their cesspool nation and clean it up. No voting for conquered people’s and all spoils go to the victors! Get rid of the families that have controlled that nation and add it to our list of assets.
I think that an invasion that controls the first hundred yards across the border would do the job.
By having US Army deployed on the Mexican side, there is no legal problem with the posse comitatus act.