Why did tecumseh disagree with american
settlers about who owned the land?

Tecumseh disagreed because he thought that the people belonging to India did not own the land which they had given up and also he believed that the land had been shared by all Indians.

Explanation:

The Shawnee Chief Tecumseh united all the Indians and protested in the American settlers on native lands. Tecumseh unified many tribes and collected the enough strength to avoid the further taking of lands y the whites. He believed to have the autonomous Indian state free from the whites. He said that the lands are all owned by the Indians and there was no point in negotiation. He also fought as a warrior to avoid the white man’s invasion in the Indian land.