Title: China's last imperial frontier
Subjects: Borderlands, Military History, Relations, Imperialism, Territorial expansion, Power (Social sciences), Foreign relations, History, China, foreign relations, China, relations, foreign countries, Tibet autonomous region (china), foreign relations, China, history, military, China, history, qing dynasty, 1644-1912
Places: Changdu Diqu, Tibet Autonomous Region (China), China, Tibet Autonomous Region, Changdu Diqu (China)
Time periods: 1644-1912, 19th century, Qing dynasty, 1644-1912