After the fall of Tang dynasty in 907 CE, China was briefly disunited for about 53 years. During this disunited time, five dynasties ruled the north while ten kingdoms ruled the south. A general under one of the five dynasties, Zhao Kuangyin, usurped the throne and quickly reunited China. Under the Song dynasty, the first paper currency and methods of rich farming were introduced. The Song improved a series of waterways and created a fairer system for awarding officials so that revolts were less likely in their bureacracy system. In 1068, the emperor, Shenzong, ordered his minister, Wang Anshi, with implementing radical reforms. He hoped to gain a monopoly on tea and to gain more money by charging higher taxes on the rich families. This unpopular act caused Wang Anshi to be dismissed from