In short: By the time a person is 18, they must effectively be able to communicate and understand conversationally in 2 languages and casually use them in daily life…, if not become completely fluent…
Other than that, any language goes (whether it is a locally-known one, or a popular one worldwide),
The only thing I hope to gain from this, is to rid the world of /Monolingual Betas/
Seriously though, has this been a policy before? Because I haven’t heard of such one…
I think this can especially be used for citizenship…
Edit: I don’t necessarily have any other presupposed requirements besides bilingualism, though we may have certain notions of such in this main goal
Edit II: In furthering this venture, I have realized that my liberalism may slightly poisoned my lens…
And for clarification…
Minimum dual language system:
Main national language + other language (likely another related language, but foreign ones are fine)
An example on how some people didn’t necessarily were forced arbitrarily, is when many people in Europe go on Erasmus (a government sponsored exchange program) and spend a year in another European country where they spend 90% of their time communicating in the local language