What qualifies a sift to be classified into one of the country channels?
I've been wondering this while sifting, as animation schools are in many different countries.

Is it the origin of the creator? Is it where video was made OR is it the subject matter it is dealing with?
Or is it any combination of these?

I'm tempted to say it's the subject matter, and that's what I have been going with so far. However, I keep bumping into this issue and I wondered what word on the siftstreet is.