Thank you, aeh, for sharing the links to Frederick Douglass' now famous speech, "What to the Slave is the Fourth of July" delivered July 5, 1852.

To provide a bit of context, placed in chronological order, on a timeline, this speech was delivered
... after Fredrick Douglass became free, was a published author, traveled abroad, and was a known abolitionist,
... prior to the Civil War, abolition, and suffrage:
... - Lincoln signing the Emancipation Proclamation (September 22, 1862),
... - Juneteenth Day (June 19, 1865),
... - Ratification of the Thirteenth Amendment to the US Constitution (December 6, 1865),
... - Ratification of the Fifteenth Amendment to the US Constitution (February 3, 1870).

Fredrick Douglass lived until 1895, and saw these changes implemented.

The life and works of Frederick Douglass provide much food for thought, including, "I would unite with anybody to do right; and with nobody to do wrong."