In which situation, overlapping differences happen?

The overlapping of social differences creates social divisions and tensions. When the differences in society overlap each other, it gives rise to social division.

Example: In US the blacks were usually poor, homeless hence were discriminated by the White Americans. This created social division.

In India, the Dalits were treated as Untouchables because they were born lower caste compared to rest. They were poor, had no homes, were not allowed to perform decent work. This created a social division in the society, which deep-rooted and India is still struggling to overcome this division.