The best answer is B.
The Warsaw pact is the name commonly given to the treaty between Albania, Bulgaria, Czechoslovakia, East Germany, Hungary, Poland, Romania and the Soviet Union which was signed in Poland in 1955 and was officially called The Treaty of friendship, Co-operation and Mutual Assistance. It was called the Warsaw pact because it was signed in Warsaw.
It was a response to the formation (by western allies) of the North Atlantic Treaty Organization (NATO). West Germany was allowed to join NATO and was allowed to re- militarize and thus the Soviets saw this as a potential threat.
Himalayan region in the north, the Gangetic Plain, and the Plateau region in the south and central part.
The Manhattan Project was the secret government initiative that lead to the creation of the first atomic bomb in US history. This program was a result of hundreds of millions of dollars worth of money and the collaboration of individuals all over the country.
Over the course of the Manhattan Project, 120,000 people were involved in the creation of this atomic bomb. This include scientists and engineers who worked together on the specifics of the bomb and the impact it would have. This success can also be contributed to the business owners and workers who helped build the technology and equipment needed to make this bomb/test it during the 1940's.
Lastly, the military worked with all of these different groups, especially the universities (like including Columbia and University of California at Berkley) who were conducting research for the government.
Politically, blacks were no longer considered property. They were their own person and didn't have to ask a white man to do anything nor take orders.
Economically, the south took major hits. Slavery supported its economy because of the slave auctions for example. It had to reroute its entire economy to prevent bankruptcy.
Socially, blacks went up in the world. They weren't entirely free since shortly after slavery was abolished Jim Crow laws were established.
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