The Evolution of Marriage · Endogamy and Exogamy

82:5.9

Outmarriage itself was a peace promoter; marriages between the tribes lessened hostilities. Outmarriage led to tribal co-ordination and to military alliances; it became dominant because it provided increased strength; it was a nation builder. Outmarriage was also greatly favored by increasing trade contacts; adventure and exploration contributed to the extension of the mating bounds and greatly facilitated the cross-fertilization of racial cultures.

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