As promised, here's the
Invasion Map documenting the landing sites of the Kafer forces.
I was trying to think about reasoning behind Europe's/North America's desolation. Maybe to do with the Twilight War somehow?
Well, they could just be saving the last superpower for last? And Europe because....it's there? The Kafers do love a good fight, and maybe they think the Americans will put up the best one?
EDIT: In looking at the map, I'm gonna chalk it up to saving it for last or lack of resources. I mean, they're basically surrounded, so the Kafer will get to them eventually...