Thank you for the opportunity to help you with your question!
the reason for high rates of STDS in a specific area might be due to, high rates of unprotected intercourse with infected persons and also it can be due to other reasons ranging from lack of enough education concerning the diseases.
lack of enough education concerning the STDS in ways like protection
having unprotected intercourse with affected persons
the fact that the blacks don't have the culture of avoiding sexual intercourse before the marriage age as compared to the whites makes some states vulnerable to these diseases
high rates of ignorance to precautionsin certain areas
Please let me know if you need any clarification. I'm always happy to answer your questions.