Source please? I have been working in Brazil for the past few years and the education level here is nowhere near 1970s Europe. Not even close. The public primary school system is so bad that any family who can afford it - even poor people - pay for private school. Sometimes only a $100 a month for the cheapest private schools. They are not very good, but they are better than the public schools and so there are an estimated 40,000 private schools in Brazil. About 40% of the primary and secondary schools. So about 60% of Brazilians get a very substandard primary and secondary school education.

At least 26% of the population earns below $56 USD a month and as a result the government gives them $13 a month but only if their children are vaccinated and stay in school. That should give you an idea of the level of poverty and the tax base upon which the public schools in those areas have to operate on.

Conversely, the free government run universities are excellent and hard to get into. Ironically, the vast majority of students accepted are from elite and expensive private primary and secondary schools. So the free public universities are mostly a service for wealthy or at least upper middle class kids.

Your claim that almost all of Latin America is more highly educated now than 1970s Europe is highly suspect unless you can provide something to back that up.