I believe that we should live in a society with much better education. An essential ingredient of that education -- much more important than the mere learning of facts -- is the understanding of how to approach a discussion, how to think logically, how to question things, etc. A crucial element of that "essential ingredient" is the understanding of the importance of context and of being informed.
I certainly didn't mean to imply that someone in Brazil should be taught, as part of their standard education, about the US constitution. But that puts the onus on them to get informed about the topic of the discussion before jumping into a discussion of it. And when participating in such a discussion, they should also probably indicate that they might not have the same understanding of the context that everyone else might have.
In short, I believe that we should all receive the education that teaches us not only the relevant context of the things we are expected to be dealing with in the future, but also that it's our responsibility to be informed when participating in discussions.
Why should someone in for instance Brazil know of these details of the USA history? The context for the Brazilian constitutions is part of the education everyone receives here in Brazil, but I don't recall learning anything about the USA constitution in school. Don't forget that HN has an international audience.