Basically the two campaigns each show what would have happened if its respective faction would win the war As such they re two separate stories As for which campaign ending is canonical the sources we have available say that both Tiberian Dawn and Red Alert 2 follow on the events of this game s Allied campaign However RA2 and by proxy RA3 don t take place in between RA1 and TD according to former C C designer Adam Isgreen but exist in a separate universe altogether rendering them spin off games by definition Hope that cleared things up