Answer:
Frederick Douglass's 4th of July Speech may be what you're looking for
Explanation:
Admittedly, he gave this speech in 1852. Nonetheless it is powerful. He was brutally honest with the people who had invited him.
Here's a link:
https://teachingamericanhistory.org/library/document/what-to-the-slave-is-the-fourth-of-july/