FamilySearch Indexing: US, Texas, El Paso—Passenger Arrival Cards, 1905–1927, FAQ
Clarification please: Birthplace/Country field, do not correct spellings or abbreviations in the instructions so, for "Chihuahua, Chih. Mex." ------ should it be "Chihuahua Chih Mex" or just "Mex"? It is more commonly being indexed and arbitrated as just "Mex".
Answer: The instruction in the field help is: "Type the term or terms as they were written. Do not correct misspellings or expand abbreviations." For the example you gave, the field would be indexed as Chihuahua Chih Mex.
8/24/14: Is it important for this to be consistently done this way? If so, should it not be incorporated into the project instructions or at least the Project Updates page?