Like I said, Canada applies its own laws in its own ways.
Now if Canada attempted to force him into its army, he might be able to claim exemption on the basis that he was also an American citizen. But whether that would be accepted or not depends on Canadian law, not American law.
Now if Canada attempted to force him into its army, he might be able to claim exemption on the basis that he was also an American citizen. But whether that would be accepted or not depends on Canadian law, not American law.
Canada could force him into their army if they so chose. They could not force me into their army. There is no recognized body of law which would allow them to do it. Ted Cruz? He owes them allegiance.