Spanish interest in the territory known as New Mexico increased during the 1580s and 1590s. Although reports of mining and missionary possibilities were significant, King Philip II of Spain was also concerned about New World explorations of rival England. As a result, Don Juan de Onate was commissioned in 1595 to lead an expedition to claim and colonize the New Mexico region in the name of the king. After many delays, Onate and his party of 400 men and members of their families left Santa Barbara, Mexico in January 1598. Instead of following earlier routes, they crossed the Chihuahua Desert to reach the El Paso area. In a formal ceremony at this site on April 30, 1598, Onate issued a proclamation, known as La Toma, taking possession of the region for Spain. Included was all land drained by the Rio Del Norte, the Rio Grande. Proceeding north, Onate established headquarters near present Santa Fe and founded the province of New Mexico. As Governor, he directed exploration of the area until he resigned in 1607. Onate's expedition and La Toma brought Spanish rule to the American Southwest and preceded colonization efforts of other European nations on the North American continent. (1981)