President Donald Trump has been compared to many historical figures, by opponents (who claim he’s another Adolf Hitler) and by boosters (who cite Andrew Jackson or Teddy Roosevelt). With his blockade of Iran, though, maybe we should start comparing him to Gen. Winfield Scott. In the mid-19th century, Scott was America’s preeminent military mind, the architect of victory in the Mexican War and the “Grand Old Man of the Army.” As the Civil War loomed, he developed a plan to defeat the Confederacy with the smallest number of casualties possible. He called it the Anaconda Plan — and like its...