A common language is one of the things that binds a nation together.
True. And conversely, a large percentage of the population which refuses to learn the common language divides the nation.
My friend was a principal at a school, she had 17 languages in her school.
Not necessarily true.
The biggest countries in the world have multiple official languages... Shit India has 15...
Switzerland has four and it’s a wonderful country with a unique culture and strong national identity.