As the title says. Suppose Pedro II is not killed in the Praieira Revolt of 1848-1853 named for the city it started in - perhaps it is more contained, perhaps troops quell it earlier (with British aid?), or maybe Pedro talks his way out of it. Does Brazil stay united or will it still break into six successor states? Does Argentina still annex most of her neighbors within a century or remain confined to Buenos Aires and the Pampas? Will the United States replace Argentina as the 'Sentinel of South America'?