What was the significance of the transcontinental railroad?
a. it was the most expensive way to travel, so only the wealthy could afford to migrate to other parts of the country.
b. american indians who were looking for work often took jobs working on the railroad.
c. the railroad was better for the environment than other ways to travel at the time.
d. people could more quickly and easily travel from coast to coast.

D.

Explanation:

People could more quickly and easily travel from coast to coast.

china unilaterally claims the entire south china sea as sovereign territory, then builds artificial islands to bolster its claim. it suddenly activates an air defense identification zone over the east china sea, and threatens to down any aircraft that does not report its position. it builds roads into indian territory, then redraws the maps to show that it is actually chinese territory. the people's republic under president xi jinping is quickly becoming the bully of asia.