The source of authority cited by the supreme court for applying the bill of rights to the states is

the Fourteenth Amendment to the Constitution

Explanation:

the Fourteenth Amendment to the Constitution specifically created to  Granted citizenship ,  civil Treatments and legal rights to all people in united states regardless of their Race.

All of these rights are covered within the bill of rights, which added ten additional amendments to the constitution. Covering all rights such as the freedom of speech, the freedom to pursue happiness, the Rights to obtain informed consent, The rights to be valued and honored, etc.

if you have to make a general question and respond to your thoughts, then this isn't really a question someone can you on. read the passage, form your question, and answer using your thoughts. no one else can understand how you interpreted this text if you don't tell us.

could you go a bit more in depth with you question? it's quite hard to understand. as soon as you do that i will be glad to : )