Was the state of Guerrero Mexico part of the state of Oaxaca Mexico?
No. Before its admission to the Mexican Union (October 27,
1849), most of Guerrero's territory was part of both the states of
Puebla, Valladolid (present-day Michoacan) and Mexico. The state
was created from the districts of Acapulco, Chilapa and Taxco from
the State of Mexico, Tlapa from Puebla and the municipality of
Coyuca from Valladolid.