> How do you even add them.. it's like asking what is the utility of the statue of liberty plus the utility of NAFTA?

You add them by asking how much each part of the utility function makes you want to do a thing.

As TeMPOraL says, for your specific example you could do that in dollars, but perhaps a more emotionally affective example than USA icons would be asking how many oranges someone would need to offer you to convince you to have a hand amputation without anaesthetic: if you’re well fed, it’s ridiculous to even ask as even a lifetime supply of citrus fruit won’t come close, but if you’re literally starving to death you might well choose to lose a hand to gain anything edible.