your argument became invalid.
You can compare conscription to slavery, but there are (and always has been) many ways to get out of the US military even if you were drafted. Not so much with slavery. Conscription in the US was never an all-or-nothing sort of thing, either, if your number came up there were a lot of deferments that didn't involve a bullet to the back of the head. Still, it was an interesting conversation until...
My parents read this blog so the rest of this reply is redacted.
UPDATE: Edited to add this link.