Nature gives men a right to employ force, when it is necessary for their defense and for the preservation of their rights.
Yes, I agree to that, as long as the rights are real and not imagined. The right to self-defense is particularly important. And in a national sense, we as a nation have the right to self defense.
On the other hand, we do not have the right to take an army and invade Canada just because we want some Lebensraum. And if we do, the Canadian people have every right to oppose us with force of arms, because they are then acting in their own self-defense.
Not that I expect us to invade Canada. But you get the point.
“In treating the right to security, we have shown that nature gives men a right to employ force, when it is necessary for their defense and for the preservation of their rights.”
It is from Vattel and the source of the 2nd Amendment.