In the ancient world, why did civilizations flourish around great river valleys? River valleys protected citizens from natural disasters.
River valleys provided an ideal environment for agriculture.
River valleys sheltered citizens from harsh weather.
River valleys contained vast mineral
resourges

In the ancient times ofcourse even now agriculture is main occupation for people. around river valleys fertilility of land is very high and there will be easy transportation

Explanation:

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.