I have literally no idea why Trump started this war to be honest. He seems to be completely mental now. Weird messages all night, making little sense, contradicting himself in even shorter periods than before. If you Dad was doing this you would be taking him to the doctors.
Someone obviously convinced him this was necessary, for what reason who knows. Lets however not confuse Trump with the USA. We have our own differences with the USA as well of course, but Trump is a different level.