The "u" in non-american english

[Zlejedi]

SimonSaysFYou said:

So all you foreigners, please explain why you add a 'u' to words like favourite (favorite), colour (color), and others? The words don't have the short o sound when you say them. I understand that english is a complex language with complex sounds, dialects, and irregularities...but this I've never been able to understand.

Because that's how they are written in proper English which we learn?

And not some American dialect version of it ?