Answer:
Culrural relativism
Explanation:
This idea was first originated in the anthropological research by Franz Boas in the first few decades of the 20th century and later popularized by his students.
It suggests that a person's behaviour cannot rightly be evaluated by a culture outside of his own. In other words, to understand ones behaviour, it should be analyzed paying attention to his culture.
He was the first president of the United States.