"evolutionary development of biological races," by 1946, from race (n.2) + ending from speciation, etc.
"the running of races, the occupation or business of arranging for or carrying on races," originally especially horse races, 1670s, verbal noun from race (v.).
in La Raza, literally "the race," 1964, from American Spanish (see race (n.2)), "designating the strong sense of racial and cultural identity held by Mexican-Americans" [OED].
"one who or that which races," 1640s of persons, 1660s of horses, 1793 of vehicles, by 1809 in American English in reference to a type of snake; agent nouns from race (v.).
WHEN a lad, I lived with my father in the then province of New Jersey, where the black snake, with a white throat, commonly called the racer, as well as the rattle snake, and other serpents, are frequently met with ; and I never remember to have heard any one dispute the power of charming belonging to several species of serpents, but more common to the black snake, called the racer, which I have twice seen in the operation. ["Extract from a letter from Samuel Beach, dated Whiting, July 24, 1795," in appendix to Samuel Williams, "The Natural and Civil History of Vermont," 2nd ed., 1809]
1650s, "having a characteristic agreeable taste; having a flavor supposed to be imparted by the soil" (of wines, fruits, etc.), from race (n.2) in its older meaning "flavor" or in the sense "class of wines" + -y (2).
The extended meaning "having a quality of vigor" (1660s) led to that of "improper, risqué," attested by 1901, which probably was reinforced by the phrase racy of the soil "earthy" (1870). Related: Racily; raciness.
Figuratively, that is racy which is agreeably fresh and distinctive in thought and expression ; that is spicy which is agreeably pungent to the mind, producing a sensation comparable to that which spice produces in taste. [Century Dictionary]
by 1928, in common use from 1935, originally in a European context, "racial supremacy as a doctrine, the theory that human characteristics and abilities are determined by race;" see racist, and compare the various senses in race (n.2) and racialism. Applied to American social systems from late 1930s.
This meaning of Nationalism in no sense implies any consent to the doctrine of Racism, which holds that unity of racial origin is the main principle of unity for civil society and that the members of each ethnical branch should properly aim at grouping themselves together into so many national States. Although it is desirable that strongly-felt national aspirations, which often depend on community of race, should be satisfied, as far as this may be compatible with justice, Racism or the Principle of Racial Self determination, as it has been called in recent years is a materialistic illusion contrary to natural law and destructive of civilisation. [James Strachey Barnes, "The Universal Aspects of Fascism," London, 1928]