Final answer:
The third Chinese state, the Sui Dynasty, is known for its creation of the Grand Canal, while the fourth state, the Tang Dynasty, is renowned for its cultural, economic and technological advancements.
Step-by-step explanation:
The third and fourth Chinese states, in what is often referred to as Imperial China, were the Sui Dynasty and the Tang Dynasty.The Sui Dynasty (581-618 CE), though short-lived, is remembered for its significant infrastructural achievements, particularly the Grand Canal.
This canal was a massive feat of engineering that linked the Yellow and Yangtze Rivers, promoting trade and helping to unify the vast Chinese empire.
The Tang Dynasty (618-907 CE) is renowned for its cultural and economic achievements. This era saw significant advancements in arts, technology and trade. Notably, the Tang Dynasty saw the dawn of woodblock printing and paper-making.
The poetry written during this period, by poets like Li Bai and Du Fu, remains influential to this day.
Learn more about Sui and Tang Dynasties