Why is it important to force students to speak English?

All I know is it should be the number 1 Lang in the US.

Coz people hate foreigners

so they can't feign ignorance

I've had people train me for jobs that don't speak English, it's pretty hard to learn if you can't understand each other. I love language but whether the country speaks mainly Spanish or English, it's probably a good idea to get basics down or attempt to learn.