It was an union composed by the nations of Piaui, Pará, Xingu and Brazil. All the nations agreed they will be united during war situations and have an unique democratic system. The agreement was supposed to be an National Union making all of the 4 nations provinces of the Pindorama Union, turns out it didnt end that way.
The system is now considerated by the members as an International Union with a Defense Pact and Cooperative relations, trying to make each other grow and share some resources.
The same union motivated the formation of the Brazilian Republic.