Which part are you referring to?  The political trap was whispered about in the 1980's Hawaii.  If no one will claims credit for the observation, I will.  

The 1/3, 1/3, 1/3 breakdown came from a history prof in my second year of college.  Not a liberal by any stretch of the political imagination, just a good historian. Oh, many of the Royalist fled to Canada after the Revolution, but I understand many returned after things settled down. Sorry, no numbers.