Why was Tecumesh unable to unite Native Americans east of the Mississippi river in his fight against the expansion of white settlement

Tecumseh lack of funds to support his military goals
The dependence of white manufactured goods and customs by those eastern native American groups
The existing rivalries among the different Native American nations in the region
Tecumseh disregard for the alliances between white settlers and those native American groups

All of the options listed could be contributing factors to why Tecumseh was unable to unite Native Americans east of the Mississippi River in his fight against the expansion of white settlement. However, the most significant factor among them is the existing rivalries among the different Native American nations in the region.

These rivalries and conflicts among Native American nations were long-standing and deep-rooted. Many tribes had historical tensions and disputes over territory, resources, and cultural differences. This made it extremely challenging for Tecumseh to unite these diverse groups and gain their collective support for his cause.

Additionally, Tecumseh's disregard for the alliances between white settlers and Native American groups could have also hindered his ability to unite tribes. Some tribes had established relationships and even intermarried with white settlers, leading to a shared dependence on white manufactured goods and customs. These alliances and dependencies created divisions among Native American groups, making it difficult for Tecumseh to mobilize them against white expansion.

The lack of funds to support his military goals could have limited Tecumseh's ability to effectively organize and equip his forces, but it may not have been the primary reason for his inability to unite Native Americans. The existing rivalries and divisions among Native American nations played a more significant role in hindering his efforts.

There is only one answer

I apologize for the confusion. The specific answer to why Tecumseh was unable to unite Native Americans east of the Mississippi River in his fight against the expansion of white settlement is:

The existing rivalries among the different Native American nations in the region.