It's because Esperanto is much easier to learn. Teaching everybody English will take thousands of hours of every persons life. It's about a 10x difference. You

It's because Esperanto is much easier to learn. Teaching everybody English will take thousands of hours of every persons life. It's about a 10x difference. You can actually learn it with negative time investment if you use it as precursor to learning English: https://en.wikipedia.org/wiki/Propaedeutic_value_of_Esperanto https://en.wikipedia.org/wiki/Propaedeutic_value_of_Esperant...