“I recalled the famous description of activist campaigns, usually attributed to Gandhi: “First they ignore you, then they laugh at you, then they fight you, then you win.” Ideas are activists of a sort; first they appear on the shadows and margins, then they’re mocked or reviled, then they come to be what everyone has always known or believed. How they arrived and who scoffed at them are forgotten. Now nearly everyone understands that this continent was inhabited for centuries before the Europeans arrived, knows that the Columbian encounter was violent and ugly, recognizes that native people are still here. Many of the most significant changes are changes of view, incremental and often invisible, both in who brought them about and when they established themselves, but from those changes much flows.”