The Qin dynasty, founded in 221 BCE, marked a pivotal moment in Chinese history. Qin Shi Huang unified China, standardized weights and measures, and began construction of the Great Wall. These achievements laid the foundation for a centralized empire. Despite its short 15-year reign, the Qin dynasty left a lasting impact. The Terracotta Army, discovered in 1974, showcases Qin's military might and artistic prowess. The dynasty's legacy includes a unified writing system and bureaucratic structure that shaped future Chinese governance.