His Worldwar series was by far his best work. Goofy, but fun, and played to its rules. Unfortunately, once he found success in that vein he then has done multiple iterations of WW2, including one in which the South won the Civil War (Lee's instructions weren't lost at Fredericksburg), Lincoln becomes a socialist, and by WW2 the South is doing a Holocaust on all the black people.
His Worldwar series was by far his best work. Goofy, but fun, and played to its rules. Unfortunately, once he found success in that vein he then has done multiple iterations of WW2, including one in which the South won the Civil War (Lee's instructions weren't lost at Fredericksburg), Lincoln becomes a socialist, and by WW2 the South is doing a Holocaust on all the black people.