When it comes to naval blockades, the one executing it is meant to target one country. But in the case of US naval blockade, the world economy is reeling in a crisis.
This makes this act one that constitutes a war crime. And this is why the US does not even have a legal justification to wage a war against Iran. All a result of one man's obsession with Iran not having a nuclear weapon. A false claim not supported by its own intelligence agencies.