Minard (1952) found an intersting case study in the coal fields in McDowell Country, West Virginia (USA).
White and black coal miners would work happily together underground. Many white coal miners would take orders from black colleauges who were places in positions of power in the coal mine.
When it came time to emerge from the coal mines to the surface to go home, white miners sat at the front of the bus and black miners sat at the back of the bus.
This study demonstrates the power of ___________________ in shaping intergroup behaviour.
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