Why did Brazil, with a "new introduction of battleships", make ships in what could be considered less than a week?
Lol.
Italy's south american fleet (yes, we had that in south america for a while) begins to blockade Rio Grande; this is not an ATTACK on it. We are simply disallowing Brazilian military ships to approach Argentina.
Any instigation such as sinking ships is just cause for defense.
Since Brazil attacked their forces first, the coalition isn't bound to come to his aid, yes?