Without knowledge of history, and therefore context, it's easy for a population to be controlled.

This is understood. History (and the humanities) are being removed from the curriculum in many western high schools.

At it's most basic:

a/ "Hey Venezuela looks fucked, Socialism must be a fucked system."

b/ "Venezuela is still suffering from the effects of Imperialism, colonialism and foreign intervention in South America. Let's try socialism somewhere without interference"

One of these people learned some historical context.

The zoomers and the generation behind them are learning less than we did about history. That's gonna fuck up the future. A population like that is easily kept reactionary and conservative.

How do we popularize the teaching of the true full history of the 20th century, in and out of schools?

I know that, for me, Radio War Nerd was massively educational.