Despite multiple complexities and cultures, Asia is integrating in new ways. “Not for centuries has that region been so fluid, so open, so cosmopolitan,” writes Ellen L. Frost in the introduction to her book “Asia’s New Regionalism.” Connections in the world’s largest, most populated and economically dynamic continent are particularly intense and innovative along Asia’s coastal areas, notes Frost, a visiting fellow at the Peterson Institute for International Economics. Rather than stand by as mere onlookers, any nation or...