The "Period of Disunity" refers to a time in Chinese history, specifically during the Three Kingdoms period (approximately 220-280 AD), when the country was divided into three rival states: Wei, Shu, and Wu. This era followed the fall of the Han Dynasty and was marked by political fragmentation, warfare, and social upheaval. During this time, various warlords vied for power, leading to constant battles and shifting alliances. Despite the chaos, the period also saw cultural and technological advancements, including developments in literature and military strategy, which would influence future dynasties in China.