There are groups for Mexico and MS. Please go to the Community page and enter the location you'd like to find and the groups pertaining to that area will pop up. Join the group that best fits your location and ask your question there. Good luck with your search, the people in those locations are more familar with the records available there. Good Luck! Sister Whicker.
just a simple friendly susggestion though - records for Northern Mexico are (normally) very much unrelated to slave records in MS. Tip: As you proceed in your questions here in the community - it is best off if you keep one topic in one post and not mix them.
and posting to each group - the ones that correspond to that group as Pamela said.
Let us know if you still have any question.