How have the European colonies helped preserve this world order, in roy's view?

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.

The answers is most likely b since during a war the other options are just nice to have. but b is needed.

This concept of fate became the new meaning of "ming." so the idea of "tian ming," the mandate of heaven, was first used by the kings of the  zhou dynasty,  who  justified their overthrow of the shang by saying that heaven had punished the shang for immorality and transferred its favor to the  zhou.