the parades of samba schools in the carnival festivities creates an extremely competitive environment where only the greatest or the most well-organized can actually hope to achieve the very sought after championship.

because of this, some of the smaller or dwindling schools reach a point in which there's little to no chance of actually gaining anything significant.

as a result, some groups come to the conclusion that instead of competing only by themselves they could, instead, join efforts and fuse with others to create a bigger and more capable organization.