Sui


 * The Sui spent lots of time and labor into building walls, but the cost of the walls broke families. Because of this the Sui dynasty was replaced by the Tang dynasty.
 * Resentment for the emperor increased and wars led to the collapse of the Sui dynasty.
 * Through the last few years of the dynasty, the wars took away many able-bodied men from rural farms and other occupations.
 * From losing able-bodied men that brought the economy down even more and damaged the agriculture base.
 * Lost a lot of money from military campaigns against Goguryeo which ended with popular revolts, disloyalty, and assassination.

1.They lost lots of money to wars, after the two wars were over the ruler Yang Gauge lost a lot of respect. 2.There was many revolts but the ruler ignored them which caused many problems. 3.The ruler Yang Gauge left for the summer, when he left the general and others took over the capital. 4.The old ruler was soon murdered. 5.Soon the Sui dynasty was forgotten for the Tang dynasty.http://encarta.msn.com/encyclopedia_761580645_2/Sui_Dynasty.html