The right to regulate marriage, the age at which persons may enter into that relation, the manner in which the rites may be celebrated, and the persons between whom it may be contracted, has been assumed and exercised by every civilized and Christian nation; and the condition of a community, moral, mental and physical, which would tolerate indiscriminate intermarriage for several generations, would demonstrate the wisdom of laws which regulate marriage and forbid the intermarriage of those nearly related in blood. It is stated as a well authenticated fact that if the issue of a black man and a white woman, and a white man and a black woman, intermarry, they cannot possibly have any progeny, and such a fact sufficiently justifies those laws which forbid the intermarriage of blacks and whites, laying out of view other sufficient grounds for such enactments."