The war in Iran has rapidly expanded beyond the Middle East, pulling in U.S. allies and bystanders alike.The big picture: Since the U.S. strikes began on Saturday, Iran has retaliated against Israel and multiple Gulf states, plunging the region further into chaos.U.S. embassies across the region remain on high alert, with the State Department urging Americans to leave immediately.Here's what we know about the countries involved.Countries involved with Iran warUnited States: President Trump ignit...