Dictatorships in Latin America during the 20th Century

After the Second World War, the global political landscape was divided almost immediately by the two Superpowers: the US and the Soviet Union. The US was decidedly capitalist and liberal, while the Soviet Union defended a socialist economy with an authoritarian government. Both of these countries pushed their respective agendas in the entire world, motivating a 'Cold War' or an indirect war of influence over the rest of the world. In Latin America, the US took control, supporting the infamous 'Operation Condor' and executing the Truman Doctrine and the Marshall Plan to bolster the war against communism. With the political imbalance in the region, Latin America started a tragic era of dictators that committed violations of human rights and that lasted for several decades. In the following article from ELTIEMPO, the author goes a little more in-depth about the dictators and their regimes in several countries in Latin America. Try to think in similar conditions of the rise of tyranny and violence, but also the particularities or differences of each country.  Also, try to establish how and why these particular countries started democratic processes and how they resulted in the current political configuration.