What caused relations to deteriorate between the united states and the soviet union in 1979?

The Soviet Union invaded Afghanistan to help its communist government.

Explanation:

In 1979, The soviet union sent its military troops to maintain peace and help the present government (communist). America saw it as a threat to Soviet involvement and started giving support to the Afghan Islamic militants to fight the Soviets. The United States CIA introduced an Operation Cyclone, which supplied arms and finance. The origin of Al-Qaeda began with the involvement of Soviet Russia in Afghanistan.        

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~courtney

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.