Why Do Humans Divide Themselves Into Groups?

Throughout this blog, I have explored the idea that understanding differences may help create a more peaceful world. However, an important question remains: If understanding is so valuable, why do humans so often divide themselves into groups?

The following article is informed by the following sources:

Tajfel, H., Billig, M. G., Bundy, R. P., & Flament, C. (1971). Social categorization and intergroup behaviour. European Journal of Social Psychology, 1(2), 149–178.

Hornsey, M. J. (2008). Social identity theory and self-categorization theory: A historical review. Social and Personality Psychology Compass, 2(1), 204–222. https://compass.onlinelibrary.wiley.com/doi/10.1111/j.1751-9004.2007.00066.x

One of the most influential psychologists to study this question was Henri Tajfel. After witnessing discrimination and conflict in Europe during the twentieth century, Tajfel became interested in understanding why people often favor their own groups while viewing others less positively.

His research led to the development of Social Identity Theory. According to this theory, people naturally categorize themselves and others into groups. These groups may be based on nationality, ethnicity, religion, language, political beliefs, or even shared interests.

Belonging to a group can be positive. It can provide people with a sense of identity, support, and belonging. However, group membership can also create divisions between “us” and “them.”

One of Tajfel’s most famous discoveries came from what are known as minimal group experiments. In these studies, participants were divided into completely arbitrary groups. Even when the groups had no real meaning, people still tended to favor members of their own group over members of other groups.

This finding suggests that humans may have a natural tendency to create social boundaries. In some cases, these boundaries can contribute to stereotypes, prejudice, and discrimination.

These ideas present an interesting contrast to the theories of Alfred Adler discussed in my previous post. Adler believed that people can develop a sense of community feeling and recognize their connection to others. Tajfel, on the other hand, demonstrated how easily people can become divided into competing groups.

Perhaps both psychologists were correct. Humans seem capable of both cooperation and division. We naturally seek belonging, but we also have the ability to expand our understanding of who belongs within our community.

This raises an important question for the topic of this blog. If people naturally form groups, can education, communication, and cultural understanding help reduce the divisions that sometimes emerge between them?

While understanding differences may not completely eliminate prejudice, learning about other people may help us recognize that group boundaries are often more flexible than we imagine. The challenge is finding ways to balance our need for belonging with our ability to connect across differences.

What do you think? Are divisions between groups a natural part of human behavior, or can education and understanding help people overcome the “us versus them” mentality?