Surnames: Mora; de Robles; Salamanca and Bautista

I have the following ancestors, that I located on FHC IGI files -
Maria Seberiana Mora, place of birth: Guadeloupe, Caribbean daughter of Nicanor Mora y Josefa de Robles. I have not located a birth record for Seberiana. She (age 18) married Jose Victorio de la Trinidad Salamanca (age 29) on 07 Oct 1840 - Parish Santa Maria Mecatabasco, Villa Del Rufugio, Zacatecas. No birth record for 'Trinidad," has been located either. On their marriage IGI Trinidad's place of birth is Guadalupe De Juanacatis,,,Mexico. 1). Where is Guadaupe De Juanacatis (in Mexico or Carribbean?)
2). Was there a migration period during the time frame of 1821 to 1840 from the Caribbean Islands to Mexico ? Or is this an example of FHC indexing error?
Thank You,
Pat