I believe that it is A , i remember hearing it i. history class
The major events that increased polarization on the world stage from the close of world war II through 1961 had to do with the Cold War between Russia and the US--primarily proxy wars such as the Korean War.
Nearly 40 countries ended aboveground nuclear tests.
Society was changing from rural (Country) to urban (City).
Explanation:
When the industrialization process started int he United States, the country started to change rapidly. Initially this process was not accepted the same everywhere, with the North embracing it while the South not being so fond of it but over time it took over all of the states.
The majority of the people lived in rural societies before the industrialization but once it started there was a massive shift of the population from the rural to the urban areas. This resulted in emptying of the rural areas and rapid increase in population and size of the cities. This happened first in the North, so huge cities rose like New York, Washington, Philadelphia, Chicago, Boston etc.
The South was slower in this process because it thought that the agriculture does the job for it economically. That quickly changed though with the change of policy of the country, so once the economic troubles started there was sharp demographic switch from the rural to the urban areas in this part of the United States.
The industrialization first occurred in Europe where European rulers fostered unusually close alliances with their merchant classes.
