Why did spanish leaders want to push spanish control into north america in the mid 1500s

Plz ive been stuck on this question forever. in 1753 george washington was sent on a mission to a. build a fort at the point where the allegheny and monongahela rivers form the ohio river. b. attack the french at fort duquesne. c. attack the french at fort neccessity. d. deliver a message to the french demanding that they leave the ohio river.

Who was the last of the "good empire" a: commodus c: marcus aurelius b: trajan d: julius caesar

According to some historians which marks at the beginning of the us civil war