Sociologists call the tendency to marry someone from a different background as Exogamy.
The social norm is the wedding outside one's social group. The class describes the range and extent of exogamy, and the laws and enforcement means that guarantee its continuity. For example;
A person of African-American descent may wed beyond their group to lower the possibility of their offspring having sickle cell anemia.
Highlighting the positive side, exogamy eases pressures within the exogamous unit because it eradicates competition over its own women. The positive worth of exchange secures coalition or boosts social solidarity among groups in society.
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