Here's what happened.

After watching the movie Lincoln, Dr. Ranjan Batra, a neurobiologist, visited usconstitution.net to learn more about the Thirteenth and its passing. He discovered that, after Congressional approval, the measure went to the states for ratification. There were several hold-outs, including Delaware, Kentucky, New Jersey, and Mississippi. But over the course of the next few months and years, many states went on to ratify the amendment.

And in fact, Mississippi ratified the amendment in 1995 — or at least they thought they did.

Batra noticed an asterisk beside the state's name along with a note that read: "Mississippi ratified the amendment in 1995, but because the state never officially notified the US Archivist, the ratification is not official."

Not official. Holy crap.

Concerned (to say the least), and after speaking to a colleague, Batra called the National Archives' Office of the Federal Register to give them the bad news. It turns out that the resolution had indeed been passed by the Mississippi Senate and House (unanimously, at that), but for some reason the paperwork was never sent to the Office of the Federal Register.

Batra's revelation got the state scrambling. On February 7, the state finally received word from the Federal Register confirming it had officially ratified the Thirteenth Amendment, prompting senator Hillman Frazier to say, "We finally got it right."