On June 19, 1865, slavery in Texas was officially abolished, ending slavery throughout the former Confederacy (reinforced through the adoption of the 13th Amendment). Today, we recognize this day as Juneteenth, a celebration and recognition of emancipation and the fragile next step in extirpating the United States of America's darkest history of slavery and racism. 45 states now recognize Juneteenth as a state holiday or day of observance.
There is so much to learn about this dark history of the United States, and about the end of slavery and the ongoing fight for civil rights and the ways in which we work to overcome this dark history and fight for the principles promised in our Founding Documents. If you are looking for a good collection of diverse resources around these issues, I encourage you to check out what is available at the Civics Renewal Network. The link provided will take you to a search related to the 13th Amendment, but you can find so much more depending on the search terms you use.