Identify one cause and one effect of the spanish settlement in north america

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.

it was certainly a debatable decision, mainly because it was based primarily on political - and not on legal or social - views. since the congress at that time was led by members of the republican party, and the territory that the tribes wanted to turn into an exclusively indian state was predominantly democratic, the proposal (as expressed in the constitution) did not succeed, but the constitution itself proved to be of crucial importance in the creation of the state of oklahoma, and, most importantly, it guaranteed the involvement of representatives of the indian tribes in the government of the future joint state.  

as a member of congress, i would have voted to ratify the constitution, or at least to have it tabled. ignoring it was an interested and partial decision.  

profound political, administrative, and social changes in the british isles.