Unique conditions or common themes in Argentina, Brazil and Chile

What are the unique conditions or common themes in Argentina, Brazil and Chile that contributed to the back and forth between populism, military and democracy since 1930?

You can use any source(s), this are the ones that I found that could be helpful:

https://www.idea.int/sites/default/files/publications/the-quality-of-democracies-in-latin-america.pdf
https://muse.jhu.edu/article/753199
https://muse.jhu.edu/article/16650

Ribeiro Hoffman, “Brazil under Bolsonaro,” Latin American Policy (2020)

Hunter and Power, “Bolsonaro and Brazil’s Illiberal Backlash,” Journal of Democracy (2019) https://muse.jhu.edu/article/713723/pdf?casa_token=cV5usJpi0KsAAAAA:bqlHp_DVeal7Imd9SJYliLUDgPqpk3ZAtc8TVpK6qWJj0SlwpUsmbgYmuS7aJ-YEuuxGnXdoIcnD
Watch the short video: https://www.youtube.com/watch?v=fbNPq-ZLzMM

Sample Solution