Re: You need actual data on the incidence of medical conditions and risk factors
The United States has created and maintained divided populations sufficiently that in certain populations some diseases are much more prevelant. For instance, "sickle cell" blood disease. From the U.S. National Institutes of Health website:
"Sickle cell disease affects millions of people worldwide. It is most common among people whose ancestors come from Africa; Mediterranean countries such as Greece, Turkey, and Italy; the Arabian Peninsula; India; and Spanish-speaking regions in South America, Central America, and parts of the Caribbean.
Sickle cell disease is the most common inherited blood disorder in the United States, affecting 70,000 to 80,000 Americans. The disease is estimated to occur in 1 in 500 African Americans and 1 in 1,000 to 1,400 Hispanic Americans."