Slavery in the United States did not end all at once. Even though the Emancipation Proclamation went into effect in 1863, the last enslaved persons in the United States didn’t know they were legally free until June 19th, 1865 when the Union Army arrived in Galveston, Texas. That day, which became known as “Juneteenth,” has been recognized as a holiday by numerous African-American communities throughout the U.S. since 1865. While it’s still not an official federal holiday, it is recognized as a state holiday by over forty U.S. states and the District of Columbia.