What was Tecumseh's primary political goal in forming his confederacy in the early 1810s?

A. He advocated genocide against White Americans in retaliation for the deaths of Native Americans.
B. He wished to avenge the death of his father and two brothers, who had died in battle against Americans.
C. He urged all Native Americans to abandon European clothing, religion, and especially alcohol.
D. He wished to unify numerous Native American tribes into a nation powerful enough to prevent further encroachment on Indian lands.
E. He urged all Native Americans to unify and move west onto the Great Plains in order to escape American encroachment on Indian ancestral hunting grounds.