The term “gentrification” turned 50 in 2014, when Next City first created this timeline. Originally coined to describe organic population shifts witnessed in London’s inner neighborhoods, “gentrification” has come to encapsulate cultural trends, economic cycles and discrete public policies. Since this timeline was first published, communities have wielded new tools and strategies in response to gentrification’s challenges. We think it’s worth a fresh look at the ideas that animate this conversation.