Over the past 50 years, nearly 4 in 10 peace agreements have failed within five years of signing. New research shows that when international partners help implement an accord, the odds improve — and the deeper their engagement, the better. Colombia’s 2016 peace accord ended more than 50 years of armed conflict. It has had high levels of global support, from negotiation to implementation. Photo by Gobierno de Chile (Government of Chile), CC BY 2.0, via Wikimedia Commons.