Answer:
A spiritual problem and backwardness
The is the same as to why did European societies develop different cultural traditions in different regions.
The answer is that different groups of human beings living in their own regions are going to naturally develop their own traditions, different from other groups, as well as their own languages, etc, because they are only or mostly in contact with people in their own individual groups.
Walter Mischel sparked controversy with trait theorists and others by stating he had found evidence in direct opposition to the idea that traits are enduring behavioral patterns that occur regardless of most circumstances. Mischel believed that situations determine behaviors, not personality traits. Trait theorists argue that a person’s behaviors are guided by personality traits.
