To my knowledge Asclepias syriaca is native only to North America. But there are other plants——most infamously Phragmites australis——where it’s native but there’s an invasive subspecies that is sadly displacing the great cattail swamps. (Sad because a cattail swamp is a huge caloric reservoir. I know I wouldn’t starve so long as we’ve got all those cattails…)

Certainly there are non-native Asclepias species. But there’s also other interesting native species like A. incarnata that makes great cut flowers if the aphids don’t get too out of hand.