What was a common concern for the leaders of the Qin and Han Dynasties in China? Indian military innovation Daoist revolutionaries Immortality People North of China

common concern for the leaders of the Qin and Han Dynasties in China was "People North of China." This refers to the nomadic tribes and groups, such as the Xiongnu, who posed a significant threat to the stability and security of these dynasties. Both the Qin and Han leaders invested considerable resources in military campaigns and fortifications, like the Great Wall, to protect their territories from northern incursions.