The 1998 240sx was not the "last 240sx in North America", it was the last 240sx period.  The 240sx was unique to North America, and was a distinctly different car from the 200sx, 180sx, or Silvia.  The S15 paragraph was left for continuity, but really does not belong in a topic discussing the "240sx". 
 The articles from 200sx, 240sx, Silvia, and Nissan S-Chassis really need to be combined into a well-constructed single article, as they are all really the same car.