There's multiple causes and effects from the Spanish settlement in North America, some of them are:
Cause; The cause for settling in North America was connected with the search of valuable resources, such as gold, silver, spices, all of which were very appreciated and there was high demand for them, so having them meant much more wealth.
Effect; One of the most noticeable effects of the Spanish settlement in North America was the destruction of the Aztec Empire, and with it their culture, language, traditions... They managed to wipe of the face of the Earth one of the most advanced and developed civilizations in the history of the Americas.
