system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why have major countries not taken to teaching Esperanto in classrooms to allow people to communicate internationally?

To rephrase my question; Why haven't we all agreed on a language that everyone should know so every human on Earth can talk with one other?
gpt
Because English largely fills this role, albeit incompletely. In general it's far more practical to get everyone to speak a language that at least some people already speak.  It's at least incrementally harder to get people to speak a language that essentially _no one_ speaks.

As for why we aren't "all in" on this, it's largely because it's vastly easier and feels better to communicate in a native tongue.  Would you give up the ability to have a natural communication with your child in order to satisfy some utopian global communication ideal?  Would you divert what little resources are already available for education in much of the world in order to learn a hypothetically useful language?  Or...would you spend those resources on something more immediately practical?