The answer is C.
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The slave states that did not secede and join the confederacy were called "border states", which were incredibly important for the North, since they provided a "buffer" between the far more hostile Southern states.
Soviet controled Stalin had a great impact on space technology and arts. It is Soviet successful launch of the sputnik that spurred a space war, that ended with American manned landing on the moon.
The soviet union under Stalin in addition led to a number of break through discoveries in nuclear science,weapons and equipments.
In arts, contemporary movie industry was heavily influence by the Soviet-USA conflict.
