You cant unselect units unless they move
Front lines are soooo needed, This is very important
All Countries do nothing about separatists. And China always has separatists even in early game in the Modern Day scenario
Countries dont declare war-on the Player unless you have occupied land i think which rarely happens because you can only Annex entire countries in a peace deal
And speaking of that let us get individual tiles in a peace deal
China inherently makes a faction in the Modern Day and always invites India and Vietnam and others in the Modern Day Scenario in every game this would happen.
AI Doesn't build a port when they get stuck on an Island