This volume presents three claims regarding the role of middle powers in the 21st Century: first, states aspiring to become or remain middle powers choose from three possible role: to be a global middle powers; to be a regional pivot; or to be a niche leader. Second, states seeking such roles need different mixes of hard and soft power sources. Third, more so than great or small powers, middle powers walk a thin line between the domestic and systemic pressures they face. In this volume, th...