Intermarriage
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Intermarriage normally refers to marriage between people belonging to different religions, tribes, nationalities or ethnic backgrounds. It has also been used to mean the opposite, namely marriage within a small group.
Mixed marriages and relationships have probably been a part of human life, to some degree, ever since there were any divisions in the human species at all. Today with increased globalisation and its effect on communication and travel, rates of intermarriage appears to be increasing. In most countries, it is totally acceptable, or even encouraged for various reasons. Some have speculated that at some point in the future, intermarriage will blend the human species into one homogeneous group again.
For thousands of years the different racial groups evolved in different ways and evolved genetic diversity. The peoples adapted to their particular environments and evolved traits which helped them survive in that particular environment. These evolutionary traits exist only in particular racial groups. It is a fact that when you take two different types and breed them, the resulting offspring are less well adapted to either environment than either of it's parents due to the mixing of their expressed genes. Thus mixing of the races produces inferior offspring that are less well adapted and posses fewer dominant expressions of the adaptations that nature pressured us to evolve. Thus by reckless interbreeding we are undoing evolution in a single generation what took hundreds of thousands of years to create.
Here is an analogy, when children fingerpaint with reds and yellows and blues, they take different colors and mix them on the page, when they are done, what color is left? only ugly brown mud and once the colors are mixed, you can never get the beautiful colors back again. This is why adults must take charge to make sure that the evolutionary features, colors and diversity of humanity survive our own ignorance, self hate and self destructive nature.
A social norm of "marrying out" is termed exogamy; the opposite ("marrying in") is called endogamy. Some parts of the world are characterized by obligatory intermarriage, for example in northwestern Amazonia among the Tukanoan groups, people are expected to marry outside their own language group (so-called linguistic exogamy. Patterns of exogamy can be characterized as patrilocal or matrilocal, depending on whether the couple normally settle with the people of the husband or the wife.
In racially segregated societies intermarriage may be known by the pejorative term miscegenation.