I wish I had a pic to show, but I noticed that NA natives reform their government within a few years of me plopping down beside them. In fact, quite quickly. I colonized NA with Connacht starting in the late 1480s and then moved my capital. I noticed that the natives were reforming their govt before 1500! i noticed this in past games and decided to colonize right next to natives so that if they did reform early, they only got between 5-7 MIL level. but that seems way too early since they should have to unlock all the native ideas. any else notice this or am i off base?