Jacksonian America is certainly tired of “endless wars.” The president understands and shares that concern. America’s steady move toward energy independence also reduces public concern about the Middle East. But Jacksonian America is neither patient nor pacifist, and there are provocations that would transform Jacksonian opinion overnight. The widespread if erroneous belief that the USS Maine had been sunk by a Spanish mine in 1898 forced a reluctant President William McKinley into the Spanish-American War.

Iran’s recent provocations have not yet crossed the classic Jacksonian red lines. Iran has not attacked American troops, launched terror strikes against the American homeland, fired on American-flagged vessels, interfered with the oil trade enough to cause a price shock in the U.S., made such progress on its nuclear program that an Iranian bomb is imminent, or invaded the territory of a country the U.S. has promised to defend.

Yet Tehran has been inching closer to these lines, and it may yet cross them.