Ameca problem

["evievillegas" <evievillegas@...>]

Became stuck looking for birth record of Juan Florencio Villegas who, 
according to his 1759 marriage record, was born in Ameca.  It was always my 
assumption that meant Ameca, Jalisco since he was married in Colotlan 
Jalisco.  However, I now notice records of Ameca, Edo and there is always 
Amecameca.  How can I find out where immigrants to Colotlan usually came 
from in the early 1700's? Possibly the State of Mexico? Thanks. Evie