To add up to Marlo, read the sources specially. With the biases in mind when they are US/US sponsored. Also if you want more visual learning I can never recommend enough: Battle of Chile youtu.be/vloyZq74SBI?...youtu.be/ntX3DBXt9ks?...

Part 1 Salvador Allende - The Battle of Chile

The Battle of Chile is a documentary film directed by the Chilean Patricio Guzman, in three parts: The Insurrection of the Bourgeoisie (1975), The Coup d'éta...

This are what I could find on YouTube in English, but if you browse enough to red/pirate movie pages you might find the full 3 parts. If not I'll work on getting it once I'm done with all my college projects