Long before the Pilgrims celebrated Thanksgiving at Plymouth in 1621, a similar feast of thanks was shared in the New World. In the 1500s, Mexican conquistador Juan de Onate led an expedition north of the Rio Grande into an area now known as Texas. To celebrate his successful journey, he and his colonists joined Native Americans in a feast on April 30, 1598-the First Thanksgiving. Bilingual with both English and Spanish translations.