score:10
Yes, albeit in a fairly weaselly way (it was tucked into the middle of an unrelated spending bill).
I'm guessing that there are legal issues here; a government-issued apology could potentially open the government up to lawsuits (which, of course, they could decline to entertain because they are the government, but that would potentially be a bad PR move).
For what it's worth, the US did apologize to Japanese-Americans interred during World War II and even provided survivors with a small amount of money in reparations in 1988.