What are some of the sources for social change and what are some of the reasons for resistance to change?

Which factors are examples of how technology may have affected the great migration apex

On average, being married has a(n) effect on happiness.

Which statement best describes the reason why the allies responded to the berlin blockade by airlifting supplies to the city? they did not have enough troops to attack the ussr. they controlled only the water routes to berlin. they controlled only one land route into west berlin. they did not want to use military force against the ussr.