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It's actually 'counting coup', not coups. It has been and still is highly romanticized and exaggerated, like most of Native American culture. There was war, real war, between tribes: every tribal history includes information on which tribes were traditional enemies.
In particular, the various groups that make up the tribes who occupied the Great Plains at the time of white incursion had been pushed there, out of the wooded regions to the east, because they had lost wars with other tribes.
Although most Native mythologies declare that a given tribe had always been in its current location ('since the world began'), every tribe had, in fact, moved around at some point. And, of course, they are all descendants of tribal groups that migrated in 10 or 12 thousand years ago -- well before anyone else, but still first in line on the continent.
(Also, your textbook's description of the geography is, um, very bad. Speaking as someone who grew up in those parts and has traveled around them a fair amount. Plains aren't mountains; the Great Plains end, quite spectacularly, at the Rockies, when you suddenly start climbing uphill at a really sharp angle. The tribes that had mountain territory didn't migrate to the plains; the plains were settled from the east.)
However, there are multiple reliable sources that agree that counting coup did happen. It was not in place of war, but something that happened during war. If you could strike your enemy in a battle -- in other words, when people were fighting to the death -- and not kill him, that was a higher achievement than killing. It also told the enemy "You're not that tough; I won't even bother to kill you, because you're not enough of a threat. I'll let you live." If you did the same thing to the same person in subsequent battles, the prestige was even higher.

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