| http://www.w3.org/ns/prov#value | - The four biggest industries in the Gulf of Mexico are oil, tourism, fishing and shipping, and they account for some $234 billion in economic activity each year, according to a 2007 study done by regional scholars and published by Texas A&M University Press.Two-thirds of that amount is in the United States, with the other third in Mexico.If the Gulf of Mexico were a country, it would be the 29th la
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