What are the five main races.
According to the article: Sub-Saharan African, European, East Asian, American, Austrailia and Oceania.
Which sounds like what 19th century scientists came up with. The 1775 treatise "The Natural Varieties of Mankind," by Johann Friedrich Blumenbach proposed five major divisions: the Caucasoid race, Mongoloid race, Ethiopian race (later termed the Negroid race), American Indian race, and Malayan race, but he did not propose any hierarchy among the races.[44] Blumenbach also noted the graded transition in appearances from one group to adjacent groups and suggested that "one variety of mankind does so sensibly pass into the other, that you cannot mark out the limits between them".[45]
So the basic ideas that were popularized are now backed up by DNA:
The mapping of the human genome, with its extraordinary complexity, has helped us understand this picture. Initial research showed that all humans shared the same basic genes and even most of the same so-called alleles, or alternate forms of genes. But over time, geneticists have come to understand that humans cluster into groups based on the frequency that alleles reoccur. The most basic clusters correspond to continental ancestry. Five are recognizable in the genome. The first belongs to those whose ancestors remained in sub-Saharan Africa. The other four pertain to those whose ancestors traveled and ultimately settled in Europe, in East Asia, in the Americas, or in Australia and the Pacific Islands. Subsequent studies based on more refined DNA markers have allowed researchers to see more numerous and distinct groupings, which frequently correspond to what we might describe as ethnicities. “The more DNA markers that are used . . . the more subdivisions can be established in the human population,” Wade observes. Geneticists now estimate that about 14 percent of the human genome has changed under evolutionary pressures over the last 30,000 years,