Depends on the context of the statement:
If it is "[you] Go back to Mexico!" that is said (return to Mexico) "Regrese a México."
If it is "Send it back to mexico" that would be "Devuevalo a México"
If it is "I wand to go back to mexico" that would be "Quero regresar a México."
If it is "Put your back to Mexico" that would be "Ponga su espalda a México."
It's "Regresa a mi"
no vuelvas embarazada!
Vuelto [Masciline] or Vuelva [Feminine]
Regrese a nosotros pronto.
Solamente quiero que regreses. (I just want you to come back).
come to is venir, and Come is Ven
come and see in spanish is "Venga y vea"
when did you come in = cuando entraste
Regresa
venir
venga a me
come inside = ¡Pase por favor!