<span>the best option is B
the development of more efficient agriculture
The emergence of efficient forms of agriculture especially in Mesopotamia, led to emergence of early city states as food was produced in surplus to feed the town population. it also led to division of labor. this form of agriculture also contributed to sedentary lifestyle and improved nutrition thus explosive population that contributed to city establishments.
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America's fear of communism from 1947-1953 was due to the increased political power of the Soviet Union. The Soviet Union had a communist system in which Stalin abused his power and took away civil liberties from his citizens. After World War II, his power continued to increase as the Soviet Union was allied/had control over several different countries in Europe including Romania, Bulgaria, Albania, and Czechoslovakia. America was worried that this communist influence would continue to spread all over the world.
The fear of communism was not only present overseas, but also in America. During World War II there were Soviet spies in the US that gave information to the Soviet government. This, along with a small communist party in America, allowed for the development of McCarthyism. McCarthyism was essentially a witch hunt for any suspected communists. Anyone perceived as a communist threat could be called in front of Congress in the House Un-American Activities Committee (HUAC).
The North and South were arguing over slavery. The South wanted slaves but the North didn't.
<span>The policy was created to prevent a European and Japanese monopoly of Chinese trade and markets. It provided protection of equal privileges among countries trading with China and pledged to protect Chinese territorial and administrative integrity from partition.</span><span />
