The People's Republic of Rio Doce is a name of a hypothetical country, puppet of the People's Republic of Espirito Santo, that is correspondent to the region of the state of Minas Gerais, it's basically Minas Gerais being puppet of the People's Republic of Espirito Santo or a union between the People's Republic of Espirito Espirito and the People's Republic of Minas Gerais. The People's Republic of Rio Doce is also used as a justification of the People's Republic of Espirito Santo for annex part of Minas Gerais to Espirito Santo and make the rest of Minas Gerais as puppet.
"The People's Republic of Rio Doce is allied with The People's Republic of Espirito Santo and both fight for make Latin America socialist and enable the creation of the URSAL."