You say that no race significantly outnumbers the others, but wouldn't how face a race bred be a part of that race? The numbers aren't even for every race.
But, I say Nord, because they almost did it back in the day. They don't like other races anyway. Plus they got the voice.
OK ya caught me. I half pay attention to the cats. The mane can't even move by himself, so what good is he gonna do. And its probably more like the Nord's battle cry since the dudes a lion...
If the Nords did to the world what they did to the snow elves, population is not an issue.