Again why do region specific games if you can fit it into crusader kings? Especially when there is some limited interactions. Also think I saw a quote a while back where paradox said they wouldn't do games like that any more.
Because they don't fit into CK? Who should they add two nearly seperated regions (completelly seperated after 1100 and impossible to contact each other) with completelly different gameplay? And yes, Pre-Columbian America would need completelly seperate mechanics. So it would be basically be two games in one. Completelly seperated, completelly different in the mechanics. The only thing which connects them was some Norse settlers in the time from 1000 to 1100 (somebody tried it from Greenland in 1121 but never came back and we never heard from that guy again). So around 100 years of circa 700.
I said 'colonies in modern sense'... The Norse don't had colonies like the British Empire, Spanish Empire or Portugal. It were some Norse groups which settled in North America on their own. They just settled their and did some trade with thew natives and back home. That's it. Using 'colonies' implies it would be more like how the Spanish or Portugues colonised America.And the greenland has norse colonies until after Columbus "discovers" america.