I have gazed into the future of this AU
and seen the return of the ABC arms race!
Argentina will say "Is this battleship with six SPY-1 faces being built to protect those Brazilian oil fields or are they just attempting to become an aggressive South American hegemon?" The first thing they'll do is go to the secret archives and dust off their nuclear bomb and ballistic missile plans - unlike many things in Argentina these probably haven't disappeared! Then they'll order a battleship with eight SPY-1 faces!
Chile will want a battleship with ten SPY-1 faces! In a few years there'll be battleships with 14 SPY-1 faces
running around down there!