Juneteenth
Juneteenth is a recently created US holiday that commemorates the end of slavery. It originated in Galveston, Texas, and has been celebrated annually on June 19th since 1866, although it has only recently received mainstream attention.
The Pan-African flag is also associated with this day, maybe I'll have them for next year.
United States of America (33 Stars)
Flown during the start of the Civil War. One of numerous 33 star styles, not officially adopted.
Liberia
A country on the West African coast that began as a settlement for freed and free-born people of color who faced oppression in the United States.