Nicholas Canny writes on the evolution of Atlantic History from the Cold War era onward. From the 1960s historians such as Jack P. Greene and Edmund S. Morgan challenged Robert Palmer’s Liberal-consensus narrative of the Democratic Revolutions in the Atlantic World. With more research on the Black Atlantic it became clear that the rise of an Atlantic Community had heavily relied on slavery and violence. Economic history further strengthened insights into how the Atlantic empires evolved out of the exploitation of Africans and indigenous peoples in the Americas. Moreover, from the mid-1990s the concept of multiple Atlantics made Atlantic History more transnational in its scope.