Yes. The native people's were perfectly capable of hunting the buffalo with spears and arrows. The white man used guns to kill off the buffalo to make way for the import of cattle to send fatty beef to the British beefeaters. Buffalo is leaner and healthier. At any rate, the U.S. government and cowboys financed by rich British beefeaters used the gun to steal North America from the people who already lived there.
People are still killing people, like gangs, and this guy in Colorado, so this country isn't really that tame. It has lots of concrete and buildings on it, but people are about the same as they always were. Just as violent and as full of animal instinct as ever.