<page_title> Qin (state) </page_title> <section_title> Wars against Chu, Han, and Wei </section_title> <table> <cell> 221 BC <col_header> Year </col_header> </cell> <cell> Qin conquered Qi and unified China under the Qin Dynasty <col_header> Events </col_header> </cell> </table>
Qin emerged as one of the Warring States and unified China in 221 BC under Shi Huangdi.