So your example is coalation of 50 tripes with council who decites major decitions? Wow. That really sound ground breaking and unique way to govern people.

Didint their end beging when they could not agree how to respond to British Crown request of aid during the American Revolution?

while the Grand Council served an important ceremonial role, it was not a government in the sense that Morgan thought.[40][41][42] According to this view, Iroquois political and diplomatic decisions are made on the local level and are based on assessments of community consensus. A central government that develops policy and implements it for the people at large is not the Iroquois model of government.

Per your source. Also important to note that those that were allowed to sit on the "grand council" were determined through hereditary succession. So if this government had power it would be essentially a confederacy ruled by nobles.

I won't disagree that a nice decentralized democratic society would be pretty awesome, but it's also a lot harder to do with 7 billion people.

In your example each clan would have been no larger than a small town. Less than 1,000 people. Of course, there were towns that used to exist in the Americas that were much larger, but for many we don't know how those were governed. Particularly those in North America. By thr time Europeans began asking the large cities had collapsed due to disease