"If only..." French forces had defeated the British at the Plains of Abraham. "If only..." Avro had built its famous aircraft. "If only..." Louis Riel's Red River Rebellion had succeeded and he'd escaped the hangman's noose. "If only..." the Louisiana Purchase had gone to Canada instead of the United States. "If only..." Henderson had missed that heart-stopping goal in 1972. "If only..." is the elemental force behind...