The enslaved Dred Scott had been taken…
1846 CE
The enslaved Dred Scott had been taken by his master in 1834 from Missouri (a slave state) to Illinois (a free state), then into the Wisconsin Territory (a free territory under the provisions of the Missouri Compromise), and finally back to Missouri.
In 1846, with the help of antislavery lawyers, Scott sues for his freedom in the Missouri state courts on the grounds that his residence in a free state and a free territory has made him a free man.
The Missouri Supreme Court overturns an initial ruling by a lower court which had declared Scott free, and the case, then, begins a long sojourn up to the U.S. Supreme Court.