how did the United States and Soviet union go from allies during the second row for to enemies engaged in the cold war?

The reason why the US became enemies with the USSR, and their communist allies was because of communism. Communism vs. Democracy was the overall premise of the Cold War. Yes, they were helpful in War, but after WW2 communist started spreading in Eastern Europe and South East Asia and Americans feared that communism will eventually overcome democracy.

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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.