All of the following are examples of secondary sources except a. a textbook that describes a series of events b. a monograph book that discusses the american revolution c. a copy of the constitution of the united states d. a book that collects eyewitness accounts i need to

d. it spread christianity. i just took the test and got it right.

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.