I don’t understand it ?

Answer

The United Nations

Explanation:

The United Nations was formed after WWII, while for the other answers they all did contribute as well as take place before the years of WWII. While the League of Nations was established after WWI to prevent war from breaking out, it failed due to no legitimate military force.

he believed that strong monarchies would lead to social and political stability.

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.