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Another way to help indigenous earthquake victims in Mexico directly is donating to the indigenous reconstruction fund.
Besides Mexico City all of the other devastated states have a high percentage of indigenous population. This bank account was set up by the Concejo Indígena de Gobierno, which is an assembly with representatives of various indigenous groups, and part of the EZLN movement.
Link to the account numbers for local and international deposits: http://enlacezapatista.ezln.org.mx/2017/09/27/bank-account-for-solidarity-deposits-for-the-indigenous-reconstruction/