Why didn't Europeans continue to use indigenous Americans as the slave labor force?

How does writers use characterization in a story

How did the spanish-american war affect american expansionism? a.) america took control of hawaii, cuba, and the pacific islands of guam. b.) america took possession of cuba and the philippines. c.) america gained control of puerto rico and hawaii. d.) america gained control of cuba, puerto rico, the pacific island of guam and the philippines.

Which of the following were major topics that divided the north and south? select all that apply. taxes federal authority slavery economics religion