The tendency for observers to underestimate situational influences and overestimate dispositional influences on others' behavior is called the .

Fundamental Attribution Theory

Explanation:

Fundamental Attribution Theory which is also called "correspondence bias", is attribution theory that explains the error of people to attribute certain behavior of other people to internal problems and underestimate or not even consider external problems/situatinal factors that may bring that behavior. Here we so often see behavior as corresponding to a disposition and not a function of the person's environment.

because the early people found out about it.

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