“Despite this expansive wording, the Emancipation Proclamation was limited in many ways. It applied only to states that had seceded from the United States, leaving slavery untouched in the loyal border states. It also expressly exempted parts of the Confederacy (the Southern secessionist states) that had already come under Northern control. Most important, the freedom it promised depended upon Union (United States) military victory.

“Although the Emancipation Proclamation did not end slavery in the nation, it captured the hearts and imagination of millions of Americans and fundamentally transformed the character of the war. After January 1, 1863, every advance of federal troops expanded the domain of freedom. Moreover, the Proclamation announced the acceptance of Black men into the Union Army and Navy, enabling the liberated to become liberators. By the end of the war, almost 200,000 Black soldiers and sailors had fought for the Union and freedom.”
 

From The American Presidency Project, Proclamation 10229—Juneteenth Day of Observance, 2021

“On June 19, 1865—nearly nine decades after our Nation's founding, and more than 2 years after President Lincoln signed the Emancipation Proclamation—enslaved Americans in Galveston, Texas, finally received word that they were free from bondage. As those who were formerly enslaved were recognized for the first time as citizens, Black Americans came to commemorate Juneteenth with celebrations across the country, building new lives and a new tradition that we honor today. In its celebration of freedom, Juneteenth is a day that should be recognized by all Americans. And that is why I am proud to have consecrated Juneteenth as our newest national holiday.”