Why did tecumseh form a confederation of native american groups? a. to prevent further loss of native american lands in the south and west c. to establish a cooperative for production and sale of native american goods b. to attempt to reclaim lost native american land in the east d. to work against the encroachment of native american lands due to railroad construction

The right answer is " a.to prevent further loss of Native American lands in the south and west "

Here is a quick explanation:

During the early 1800s, Tecumseh, a leader of the Shawnee, attempted to unite American Indian tribes west of the Appalachian Mountains into a confederation. Tecumseh believed that the land did not belong to a single tribe. In reality, no one owned the land except for the Master of Life, the Shawnees' principal god. Tecumseh believed that the only way that American Indians could transfer land to the Americans was if every tribe agreed to it. Tecumseh wanted to force the Americans to deal with all of the tribes in unison. Separately, the individual tribes did not have much power. Together, Tecumseh hoped, they would be a major deterrent to white expansion.

the authority to tax.