According to the context, Pitirim Sorokin's belief that societies have a natural tendency toward social change is called the principle of immanent change.
What is social change?
It is a modification or fluctuations experienced by the structure of a society in relation to its norms, values or forms of government, Pitirim Sorokin addressed social differentiation, social stratification, and social conflict.
Consequently, he believed that human history, rather than tending in a linear sense towards progress, is subject to a continuous succession of fluctuations toward social change, he called this process the principle of immanent change.
Therefore, we can conclude that according to the context, Pitirim Sorokin's belief that societies have a natural tendency toward social change is called the principle of immanent change.
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