In Sherif and his colleagues' study on ingroup and outgroup social behavior,they found that by simply dividing boys into two groups and having the groups compete against each other,
They could

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Sherif and his colleagues' study, particularly the Robbers Cave Experiment, demonstrated that intergroup competition led to increased hostility and prejudice between the groups. This was observed when boys were arbitrarily divided into groups and then engaged in competitive activities, which heightened in-group solidarity but also out-group antagonism.

In Sherif and His Colleagues' Study on Ingroup and Outgroup