We are also a military branch, subject to Federation interests, but it's a voluntary coalition of planets, we don't seek to grow our territory outward. Slavery was abolished as a human practice many years ago, from my time. [Sulu tilts her head and thinks for a moment. Because it's true that not everything is the utopia that she describes.]

There are some cultures that engage in slave trade, but Federation policy requires a ceasing of the practice before the people can be inducted in. Not everyone chooses to join the Federation, as you might guess.

[Coming from a point of history, she's curious to know his opinion on slavery as well. The concept that he might willingly embrace insanity is something that she doesn't know what to do with, just yet.] ...you've been through a lot in your lifetime. Haven't you?