For the most part the injuns were nomadic in nature. Also they waged war against each other. It wasn't 'til we had been here for a couple of centuries that they caught on to the idea of land ownership. By then it was too late.
True, but some bands of the Sioux made the Black Hills their winter camp (hard to roam on the Northern Plains in winter) every year. The treaty which assured them those lands 'until the sun no longer rose in the East', was nullified by the discovery of gold.
Consider, the Homestake Mine at Lead, SD (pronounced "Leed") produced over 43,900,000 ounces of gold, (a 13.5 ft. cube, roughly), which would be worth over $78 Billion today, that's some powerful treaty breaking medicine.