<Tr> <Td> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> </Td> </Tr> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> <P> The overseas expansion under the crown of Castile was initiated under the royal authority and first accomplished by the Spanish conquistadores . The Americas were incorporated into the Spanish Empire, with the exception of Brazil and Canada, and the crown created civil and religious structures to administer the region . The motivations for colonial expansion were trade and the spread of the Catholic faith through indigenous conversions . </P> <P> Beginning with the 1492 arrival of Christopher Columbus in the Caribbean and continuing control of vast territory for over three centuries, the Spanish Empire would expand across the Caribbean Islands, half of South America, most of Central America and much of North America (including present day Mexico, Florida and the Southwestern and Pacific Coastal regions of the United States). It is estimated that during the colonial period (1492--1832), a total of 1.86 million Spaniards settled in the Americas and a further 3.5 million immigrated during the post-colonial era (1850--1950); the estimate is 250,000 in the 16th century, and most during the 18th century as immigration was encouraged by the new Bourbon Dynasty . </P>

Why did spain establish colonies in north america