Final answer:
If all the tribes that had been removed to Oklahoma had united into a single nation of Native Americans, it could have had significant benefits for their rights, land, and culture.
Step-by-step explanation:
If all the tribes that had been removed to Oklahoma had united into a single nation of Native Americans, it would have had a significant impact on their ability to advocate for their rights and protect their land and culture. By uniting, they would have had a stronger collective voice to negotiate with the U.S. government and assert their sovereignty. It could have also provided greater opportunities for economic development and self-governance. However, it is important to note that unity among tribes can be challenging due to differences in culture, language, and history.