How did the theory of social darwinism justify european imperialism during the 19th century?
a. it suggested that a country's people had the right to select their own government.
b. it suggested that powerful countries had the right to rule over weaker countries.
c. it claimed that african and asian people should be killed to make territories completely european.
d. it argued that wealthy states had a responsibility to provide financial aid to poor countries.

in the 1800s, locomotives powered by steam made transportation faster and cheaper. the resulting rapid growth of railroads led to the connection of the atlantic and pacific railroad in oklahoma city in 1897.

in the last years of the century, the improvement of steam-based engines the expansion and growth of railroads. this growth increased when the companies started to build and expand, such as the atlantic and pacific railroad, which connected new mexico with california, and missouri with oklahoma. many of these new networks were built in oklahoma, and these changes transportation henceforward.