"There is a wide consensus that the racial categories that are common in everyday usage are socially constructed, and that racial groups cannot be biologically defined."[1]

From a genetic perspective there is basically no basis for the traditional categorization of race. Two people of the same skin color, from the same country, who would be considered by traditional definitions to be the same race, can have completely different genetic lineages. There is a National Geographic documentary that discusses this called "The Human Family Tree" that is available on Netflix.

[1] https://en.wikipedia.org/wiki/Race_%28human_classification%2...