evidence: Central to China’s long-enduring identity as a unitary country is the province, or sheng ("secretariat"). The provinces are traceable in their current form to the Tang dynasty (618–907 ce). Over the centuries, provinces gained in importance as centers of political and economic authority and increasingly became the focus of regional identification and loyalty. Provincial power reached its peak in the first two decades of the 20th century, but, since the establishment of the People’s Republic, that power has been curtailed by a strong central leadership in Beijing. Nonetheless, while the Chinese state has remained unitary in form, the vast size and population of China’s provinces—which are comparable to large and midsize nations—dictate their continuing importance as a level of subnational administration.