"5.
The Emancipation Proclamation didn’t actually free all enslaved people.
Since Lincoln issued the Emancipation Proclamation as a military measure, it didn’t apply to border slave states like Delaware, Maryland, Kentucky and Missouri, all of which were loyal to the Union. (Missouri actually had two competing governments; one loyal to, and recognized by the Union, and one loyal to the Confederacy). Lincoln also exempted selected areas of the Confederacy that had already come under Union control in hopes of gaining the loyalty of white people in those states. In practice, then, the Emancipation Proclamation didn’t immediately free a single enslaved person, as the only places it applied were places where the federal government had no control—the Southern states currently fighting against the Union.
Despite its limitations, Lincoln’s proclamation marked a crucial turning point in the evolution of Lincoln’s views of slavery, as well as a turning point in the Civil War itself. By war’s end, some 200,000 Black men would serve in the Union Army and Navy, striking a mortal blow against the institution of slavery and paving the way for its eventual abolition by the 13th Amendment."
https://www.history.com/articles/5-things-you-may-not-know-about-lincoln-slavery-and-emancipation
"Lincoln's Ownership of Slaves Confirmed in New Book by Kevin Orlin Johnson from Pangaeus Press
Historian recovers original affidavit in which Lincoln ordered the sale of slaves whom he'd inherited."
https://www.prweb.com/releases/lincoln-s-ownership-of-slaves-confirmed-in-new-book-by-kevin-orlin-johnson-from-pangaeus-press-851882325.html