Qin Unification of China

230–221 BC China Status: ended Casualties: Hundreds of thousands

In nine years Qin swallowed the other six kingdoms. The First Emperor standardised script, weights, currency, axle-widths; began the Great Wall; built the terracotta army for his afterlife. The unified Chinese state has endured, with intermissions, for 2,200 years.

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Belligerents

Qin under Ying Zheng (Shi Huangdi)
Han, Zhao, Wei, Chu, Yan, Qi

Casualties

Hundreds of thousands

From World at War, an interactive atlas by Jairus Pereira. Figures are approximate, drawn from Wikipedia, UCDP, ACLED and academic sources — a design artefact, not an authoritative register. Contact.