WASHINGTON/BEIJING -- When a rising power challenges a ruling power -- as Athens did with Sparta in ancient Greece, or as Germany did with Britain a century ago -- most such contests have ended badly, often for both sides.
Yan Xuetong: 'No war, but clashes possible'; Bonnie Glaser: 'Coexistence difficult'

WASHINGTON/BEIJING -- When a rising power challenges a ruling power -- as Athens did with Sparta in ancient Greece, or as Germany did with Britain a century ago -- most such contests have ended badly, often for both sides.