What prevented Tecumseh from uniting Native Americans east of the Mississippi River in his fight against the expansion of white settlement?
A. Tecumseh's lack of funds to support his military goals
B. the dependence on white manufactured goods and customs by those eastern Native American groups
C. the existing rivalries among the different Native American nations in the region
D. Tecumseh's disregard for the alliances between white settlers and those Native American groups