<Ul> <Li> Shen Buhai </Li> <Li> Duke Xiao of Qin </Li> <Li> Shang Yang </Li> <Li> Shen Dao </Li> <Li> Zhang Yi </Li> <Li> Xun Kuang </Li> <Li> Han Fei </Li> <Li> Li Si </Li> <Li> Qin Shi Huang </Li> </Ul> <Li> Duke Xiao of Qin </Li> <Li> Qin Shi Huang </Li> <Tr> <Td> Han figures (show) <Ul> <Li> Jia Yi </Li> <Li> Liu An </Li> <Li> Emperor Wen of Han </Li> <Li> Emperor Wu of Han </Li> <Li> Chao Cuo </Li> <Li> Gongsun Hong </Li> <Li> Zhang Tang </Li> <Li> Huan Tan </Li> <Li> Wang Fu </Li> <Li> Zhuge Liang </Li> </Ul> </Td> </Tr>

What did the han dynasty accomplish that brought about drastic change in sea trade