Which ethnic group has the highest incidence of sickle cell disease (SCD)?

Question

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The disorder is inherited as an autosomal-recessive single-gene trait and is most common among people with African or other equatorial ancestry. The incidence of SCD in the United States among African Americans is about 1 in 400 live births. Carrier status, in which a person has only one mutated beta-globin gene allele, is estimated at 1 in 15 African Americans. Both SCD and sickle cell trait have a far greater incidence in East Africa and other equatorial countries.

Which Ethnic Group Has the Highest Incidence of Sickle Cell