I don't think a 2050 war between developed economies will involve many people... It'll be drove vs drone mostly.

It'll be a test of the economies of the nations to see who can build most high tech drones quickest and who can do R&D fastest to outclass the enemies inventions. Drone aircraft, ships, missiles, bombs.

I hope that as soon as one side has clearly better and more drones, the other will surrender, ideally before substantial loss of life.

The minorites who will be the majority will not be committed to imperialism and empire building like the current Caucasians who are in charge of the US.

Starting from a population 3x higher, it may not matter...