Before the arrival of the europeans, the caribbean islands were settled by
a. the aztec and the olmec.
b. the arawak and the carib.
c. the creole and the maya.
d. conquistadors.

Before the arrival of the Europeans, the Caribbean islands were settled by "B. the Arawak and the Carib," since after the European's arrival many of these Natives were killed. 

The transcontinental railroad provided a means of fast transportation. it cut a 6 month trip into 6 days, created jobs for many people and encouraged immigration. the homestead act played a huge role in western expansion; it allowed settlers to begin a fresh start, and gave them land in exchange for their residence for up to five years and a small fee.