Explain the conflict between the United States and the Soviet Union. Why were
these two countries at odds?

During World War II, the United States and the Soviet Union were allies in the fight against Nazi Germany. Defeated the common enemy, the former allies became opponents. Thus, with the end of the Second World War, in 1945, a new and different war started: the Cold War.

The rivalry between the two superpowers originated from the incompatibility between the ideologies defended by each side. This ideological incompatibility could be seen in the fact that each superpower had a different political system and organized its economy differently from the other. While the United States defended capitalism, democracy, principles such as the defense of private property and free enterprise, the Soviet Union defended socialism and principles such as the end of great private property, economic equality (a society without rich and poor) and a strong state capable of guaranteeing the basic needs of all citizens.

no statements but ok.

the statement that best describes the idea of manifest destiny that was used in the 19th century would be that "it was fate that the united states would continue to  expand westward," since people thought the us was "destined" to do so. 

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.