Which race can have naturally Black hair ?

I'm a Black American and I told a lady at Sallys Beauty I wanted to go back to my natural hair color Black. She basically told me I can't have Black hair because only White and Hispanic people have Black hair. Well since then I have let my hair grow out and colored my tips brown and guess what my almost 8 inches of new hair grew out from the root Black. So I guess they were wrong. But curious what others think ?

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