Thank you.
Now we get down to it. Our government solely derives its powers from the people. We delegate our own powers to it. We cannot delegate powers to the government that we ourselves do not have. I do not have any legitimate power to compel my neighbor to fight, or do anything else against his will. This fact does not change when any number of people collude to deprive another of his rights - it is equally immoral for 1 person to steal from another as it is for 100 million people to steal from another. So too it is with slavery. The powers of delegation do not increase with economies of scale.
We have the right to defend ourselves. We delegate that as a power to the government. That's the extent of it, and it doesn't include making a slave of others. To do so implies that our government has powers that are not delegated from the people, that it has more power than the people, that it has ownership of people. This is alien to our form of government.
We also delegate the power to raise armed forces. Implicit in and inseparable from that power is the conscription of manpower to staff those armies, when needed for the common defense. You may believe conscription is slavery but that doesn't make it so.
You cannot convince me that it is, I probably cannot convince you that it isn't. Nevertheless, the Supreme Court has repeatedly ruled that it isn't.