I believe that I've finally found a great grandfather coming into the U.S. from New Orleans, and having left for New Orleans from Veracruz and Tampico. how and where do I find information in Veracruz on him?
he was Charles Wagner, b. 1855-1860, a mariner
I know nothing of his time down in Veracruz, whether it was simply a link in his journey or a home town or anything at all. I've researched very little in Mexico, and don't know the next step to take. someone did mention customs and immigration to me, how do I contact them?

it is now September and I'm finding just next to nothing online, and no responses to queries. any help is appreciated.