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This is not my particular area of expertise, so please bear with me and correct me if I'm wrong or deficent in

In 1964, as many members are aware, a right-wing military coup, aided by the US government, toppled the government of left-wing President Joao Goulart in Brazil, sending the country into thirty years of military dictatorship.

How could this have spiraled into a civil war? IOTL, both sides seemed to think that a civil war was a likely outcome. The US, for example, made arrangements to ship 110 tons of ammunition to anti-Goulart forces, as well as deploy a carrier battle group off the Brazilian coast. It is also worth noting that the loyalties of the Brazilian military as a whole during the coup were a matter of much intrigue; Goulart was seen as trying to cultivate support among NCOs against the conservative officer corps in the leadup to the coup, and a number of generals did not sign on to the coup until relatively late in the game.

If the situation had devolved into a full-on civil war, what would be the likely outcome? How do other regional powers respond? Would the US intervene militarily, and if so might that butterfly major deployments in Vietnam post-1964 as IOTL? What of Cuba? Might Che Guevera attempt to aid leftist forces in Brazil?
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