The Qin Dynasty was founded by Qin Shi Huang, who unified China for the first time in 221 BCE and became its first emperor. He instituted harsh authoritarian rule and major reforms, standardizing laws, currency, weights and measures. Qin Shi Huang oversaw vast construction projects including the Great Wall and connected China with a network of roads and canals. However, his oppressive rule led to widespread rebellion after his death in 210 BCE, causing the short-lived Qin Dynasty to fall in 206 BCE.