Important Dates From Exploration And Colonization By LoganAllen 1519 Pineda maps Gulf of Mexico 1537 La Salle settle Cabeza de Vaca reports on explorations in Texas 1682 Establish firs mission at Corpus Christi de la Ysleta 1685 La Salle settle Fort St. Louis 1687 Father Hidalgo caused the Spanish to be suspicious of French colonization 1690 Establish the mission San Francisco de los tejas in East Texas. 1st mission in East Texas 1718 San Antonio founded 1719 East Texas mission are moved to San Antonio 1720 Mission San Jose is completed in San Antonio and other missions are built