C seafloor spreading at mid-ocean ridges
He postulated that all the continents were once joined together in a single landmass and had since drifted apart.
He stated in his book that " the Mid-Atlantic Ridge ... zone in which the floor of the Atlantic, as it keeps spreading, is continuously tearing open..."
An appalling of black codes and other racist laws/acts as well as adding the 14th amendment which gave African Americans a vote.
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The answer is C) 1950's
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The cooperation had already degenerated because Stalin had already reneged from his prior commitment to allow for free and fair elections in the eastern Europe region where soviet union had already exerted control. This was in line with Stalin plan of containing the vestiges of capitalism and spreading communism.
