1919?

So, if you are reading a work of history - in this case, about the 1934 St. Louis Caridnals - and you find that the author states World War I ended in 1919, do you immediately return the book on the premise that if the author and can't get that fact right, how can you trust them to get anything else write?

Or do you just ignore it and keep reading, since it's not exactly a biography of Kaiser Wilhelm or Woodrow Wilson?

ETA: 1919, not 191 as orignally posted. D'Oh!