Uniracial

Accordingly the Semite, long subjected by the Aryan, emerges from his primal pre-historic subsidence, and participates as an independent factor in the World's History, which is no longer uniracial as in antiquity, but bi-racial—its character during the whole medieval time.

Source: wiktionary

Finally, it had been earlier noted by new residents moving into what is now the Center District that prior to and during its change from a uniracial (predominantly white) to a biracial system and again to a uniracial (predominantly Negro) school system that the quality of their children's previous educational experiences did not eqiup^([sic]) them to compete on an equal basis with resident children in the same grade and classifications.

Source: wiktionary

The world’s largest country, China, which constitutes 20% of the world’s population is at least 94% uniracial.

Source: wiktionary