The correct answer is C) They established a republic governed by a Constitution similar to that of the United States.
The form of government that many Native American nations established were: "They established a republic governed by a Constitution similar to that of the United States."
Native American Indian tribes lived under a sovereign concept called "Tribal Governance." each tribe had its own form of government. They had their own set of laws and regulations and even some had a primitive concept of checks and balances, like the one later adopted by the founding fathers of the United States.
