Because it involved countries all over the world, there was new technology such as chemical warfare, tanks, planes, etc. and it was unrestricted warfare. The countries were attacking civilians as well. Also there were diseases.
Answer:B
Explanation: the expansion of the railroads is how the west grew. Most towns came about because of a train station in the area and the people settled around that area.
<span>cultural values, religious beliefs, and the technological</span>
It was established in option b.1911
