| abstract | - The Han Dynasty ruled in an era of Chinese cultural consolidation, political experimentation, relative economic prosperity and maturity, and great technological advances. There was unprecedented territorial expansion and exploration initiated by struggles with non-Chinese peoples, especially the nomadic Xiongnu of the Eurasian Steppe. The Han emperors were initially forced to acknowledge the rival Xiongnu Chanyus as their equals, yet in reality the Han was an inferior partner in a tributary and royal marriage alliance known as heqin. This agreement was broken when Emperor Wu of Han (r. 141–87 BCE) launched a series of military campaigns which eventually caused the fissure of the Xiongnu Federation and redefined the borders of China. The Han realm was expanded into the Hexi Corridor of modern Gansu province, the Tarim Basin of modern Xinjiang, modern Yunnan and Hainan, modern northern Vietnam, modern North Korea, and southern Outer Mongolia. The Han court established trade and tributary relations with rulers as far west as the Arsacids, to whose court at Ctesiphon in Mesopotamia the Han monarchs sent envoys. Buddhism first entered China during the Han, spread by missionaries from Parthia and the Kushan Empire of northern India and Central Asia. From its beginning, the Han imperial court was threatened by plots of treason and revolt from its subordinate kingdoms, the latter eventually ruled only by royal Liu family members. Initially, the eastern half of the empire was indirectly administered through large semi-autonomous kingdoms which pledged loyalty and a portion of their tax revenues to the Han emperors, who ruled directly over the western half of the empire from Chang'an. Gradual measures were introduced by the imperial court to reduce the size and power of these kingdoms, until a reform of the middle 2nd century BCE abolished their semi-autonomous rule and staffed the kings' courts with central government officials. Yet much more volatile and consequential for the dynasty was the growing power of both consort clans () and the eunuchs of the palace. In 92 CE, the eunuchs entrenched themselves for the first time in the issue of the emperors' succession, causing a series of political crises which culminated in 189 CE with their downfall and slaughter in the palaces of Luoyang. This event triggered an age of civil war as the country became divided by regional warlords vying for power. Finally, in 220 CE, the son of an imperial chancellor and king accepted the abdication of the last Han emperor, who was deemed to have lost the Mandate of Heaven according to Dong Zhongshu's (179–104 BCE) cosmological system that intertwined the fate of the imperial government with Heaven and the natural world. Following the Han, China was split into three states: Cao Wei, Shu Han, and Eastern Wu; these were reconsolidated into one empire by the Jin Dynasty (265–420 CE).
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