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Back in 2011 Iran threatened to close the Strait of Hormuz. From the New York Times:
"Rear Adm. Habibollah Sayyari, Iran’s naval commander, said that “Iran has total control over the strategic waterway,” and that “Closing the Strait of Hormuz is very easy for Iranian naval forces,” in remarks carried by Press TV, an official Iranian news site.
"Both the Defense Department and the United States Navy’s Fifth Fleet, which is based in Bahrain and patrols the Strait of Hormuz, responded to Admiral Sayyari’s remarks in statements that suggested American warships would stop the Iranians if necessary.
“The free flow of goods and services through the Strait of Hormuz is vital to regional and global prosperity,” Lt. Rebecca Rebarich, a spokeswoman for the Fifth Fleet command in Manama, Bahrain, said in an emailed response. “Anyone who threatens to disrupt freedom of navigation in an international strait is clearly outside the community of nations; any disruption will not be tolerated.”
And that's the way it's been year after year. Iranians keep harassing ships in the Strait and American military keeps them from taking full control. It's like continual war games going on. The question is, would Iran take full control of the Strait and decide which ships can go though and which ships cannot if the American military left the area entirely?