Irish and Italian people were previously considered separate races but have merged into the "white" race. Have the genetics of Ireland changed drastically in the past 100 years? Or was it the social construct of "race" that changed? Why do some countries consider certain groups a different race and other countries view them as a socioeconomic class e.g. gypsies? Humans migrate and interbreed with different genetic groups and have been doing so for a long, long time. We are really a spectrum of genetic differences and not really a bunch of grouped individuals.