Mexio Timeline By: Tianna By Mrs.Whitbread Jan 23, 1200 The Olmec civilaztion developed along Mexico's Gulf coast 1200 BCE Jan 23, 1300 The Mechica/Aztecs settled in the valley of Mexico Jan 23, 1500 Spanish arrived Jan 23, 1821 Mexico won independence from Spain Jan 23, 1876 Porfirio Diaz came to power Jan 23, 1970 Canada adopted the policy of multiculturalism