Answer: "café com leite" (Coffee with Milk). It is a metaphor, of course. "Coffee" is for state Sao Paulo and "Milk" is for Minas Gerais.
Explanation: This alliance came into existence at the beginning of the 20th century and continued until 1920s. During 1920s started to degenerate. Sao Paulo tried to dominate rest of the country at all price and there was a group of states that did not like that (Rio Grande do Sul, Alagoas, Minas Gerais and others). Culmination took place in 1930 elections ....according to elections Julio Prestes was supposed to be a president, but there was a coup made by other states (led by Rio Grande do Sul, i.e. advocate and politician Getúlio Vargas). The coup took place in October 1930 and Vargas got to power. Constitution from 1891 ceased to exist and Vargas changed a political map of Brazil. New Era began: "Era Vargas".