The number of during wwi is the total number of people who were killed, injured, or went missing.

The number of people who died in World war I,  is estimated by the officials and historians because of no availability of any written records. In war, it is always estimated about the casualties by observing the destruction on both sides of the parties. It is predicted that during World War I, the total number of people who killed were approx 15 to 19 million, 23 million injured, along with 6 million missing.  

explanation: j

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.