The best national security is for it to be in the interest of the counter party to trade with you rather than attack you.
Tariffs and protectionism tilt the favor closer to attack. In the extreme, a nation that completely refuses to trade can't offer nor take anything beyond spoils of war.
Tariffs and protectionism tilt the favor closer to attack. In the extreme, a nation that completely refuses to trade can't offer nor take anything beyond spoils of war.