No, it's not theft. And no, whites aren't the 'real' illegals... And when given the choice to adopt the methods and tools brought by progress, the native americans decided not to advance themselves with knowledge, just arm themselves guns. Guns to kill each other and to kill the Europeans. Trying to make things one-sided in history is a fools' errant buddy.
They didn't even adopt irrigation and advanced agriculture to start founding large settlements and show signs of a occupied land.
How little you know of what you speak.
If I sold YOU a firearm could you make another one from scratch? I don’t mean after buying a kit from some dealer, I mean build one completely on your own? As in smelt the ore, mold the metal, shape and bore the barrel, construct a trigger mechanism? Construct all the other parts all by yourself? I highly doubt it, and you would still need all the technological skills and manufacturing infrastructure to do it. You think the whites gave that to the Natives when they sold firearms to them?
As for your agriculture comments?
The Cherokee in Georgia had received recognition of their semiautonomous status in a federal treaty in 1791. They become farmers, ranchers, and cotton producers. They developed their own constitution, built roads and churches, developed a successful educational system, and owned slaves. The Cherokee also refused to sell their highly prized and fertile lands to whites. So President Andrew Jackson, under his Indian Removal Act of 1830, kicked them out to the Indian Territory (present day Oklahoma) and let whites take over their lands.
Prior to that there were the Pueblos (Hopi, Zuni, etc.) who were farmers, dug wells, built permanent housing structures, engaged in trade, and also began sheep herding after encountering the Spanish. The Navaho picked up these skills after contacting the Pueblos. All but sheep-herding occurred well-before any white men arrived in their territories.
The Iroquois Nation was organized sometime between 1100 A.D. and 1450 A.D., well-before any white men came to North America. They also farmed and had a highly organized system of government. Their Constitution had significant influence on the creation of our own.
All tribes had art, crafts, songs, and often acted more civilized than European invaders. You do know that “scalping” was introduced by Europeans right? It wasn’t a Native American invention.
I'd like to say I am surprised at your slanted view of history in attempts to justify how current Americans "don't owe" native peoples anything, but I'm not. It's similar to the selfish and short-sighted attitude many Conservatives have about "private enterprise." Having a right to w/e because "we earned it" (by ruthlessly taking from or exploiting others) and its "ours." Then acting with moral outrage when others use the same tactics to deprive them of "what's theirs." Laughable.