The year is 1955, Ernesto Guevara was getting ready to coup the Argentinian goverment, after many years of failed goverments, autocoups, and many other things. 12 of november, the streets of Buenos Aires are calm, strangely calm, then a strange thing happend, many artillery bullets were shot from somewhere, nobody knew, but many runned to their homes, when the situation seemed calm, soldiers from guerilla organizations stormed the Casa Rosada (Gov. House) and kicked the defacto president Aramburu, just 3 days later, the first Guevarist goverment was stablished. The militias started to work, they needed to erase the problem from the root, persecute all the fascist groups and execute them for their crimes.
Because of the revolution and a great oportunity for global power, the soviets aided Argentina in every matter they had.
Now the year is 1956, after only one year, a great friend of guevara, Castro, makes a proposal, help him make a caribean union leading from La Havana all the way to Bogota, in exchange, guevara would have a new ally on the recently formed; Union of Socialist-Soviet Warriors in South America.
This sparked the Jamaican revolution, where, caribean countries like Jamaica, Cuba, and the Dominican Republic would declare independence and form a caribean union just like Castro said.
Seeing all the revolts in south america, Carlos Marighella, aka the profesor, would start his own movement to try and get rid off the fascist dictatorship in Brazil. The Alianza Libertadora Nacional would kidnap the american embasador in Brazil, causing a mayor crisis in the Brazilian goverment, only a few months later, the Brazilian revolution would start, the people were tired and angry, and they got their guns and rushed to the street to start the rebellion.
Guevara saw this, asked the soviets and caribeans for help, and got in the Brazilian Revolution.
The united states wasn't in a great position, having lost the Korean War, and not doing good in the Indo-China war, sparked many protest in all of the country, demanding the retirement of the troops and that Eisenhower stepped out the office.