The statement that best explains the original significance of Juneteenth is:
"Juneteenth commemorates the arrival of the Union army in Texas and the announcement that enslaved people were free."
This marks the day in 1865 when Union soldiers arrived in Galveston, Texas, and announced that the Civil War had ended and that enslaved individuals were free, effectively marking the emancipation of enslaved people in the last holdout of the Confederacy.