Final answer:
Delaware, not Virginia, is the state that did not leave the Union during the Southern secession of 1861. Despite having a small population of slaves, Delaware did not vote to secede.
Step-by-step explanation:
The question about which state did not leave the union during the Southern secession of 1861 pertains to the events during the start of the American Civil War. The correct answer is not Virginia, as Virginia did secede from the Union. However, four crucial slave states remained in the Union despite deep divisions. These states were Delaware, Maryland, Missouri, and Kentucky. Delaware, even though it was technically a slave state, never voted to secede. Hence, the correct answer to this question should be Delaware, not Virginia.
Learn more about Southern secession of 1861