They got conquered because of the military technology gap. Even then, there are a bunch of natives still existing on their own land all over the place somehow receiving all sorts of free money.
Apparently he was bullied as a kid. At least he burned it down at night time and didn't go Columbine.
How are you gunna outproduce a gattling gun and cannon balls? It's a bringing a knife to a gunfight problem.
It's not a low birth rate issue. Populations rise and fall… it's a not having the best technology problem, or conquering too fast and spreading out your resources problem.
Or a your politicians fuck kids and they're blackmailed by the enemy problem.
Anyways, it's really not that complicated if you're retarded enough.