The United States has been at war with Iran since February 28th. And for a month and a half, Iran’s main leverage over the U.S. has been their control over the Strait of Hormuz — a key global shipping route. Iran has attacked ships that try to pass without approval. And recently they’ve insinuated that one part of the Strait — the part near Oman — is not safe. Which means that captains had to go…