Answer:
It is correct that the first Sui ruler was Wendi, who unified northern China and seized control of western regions.
Step-by-step explanation:
The Sui Dynasty was a Chinese dynasty founded in 581 in northern China by Yang Jian, a former servant, who renamed himself as Emperor Wendi. In 589, his troops occupied southern China, ending the reign of the last southern Chen Dynasty and thus reuniting China after a quarter-century of disunity. In an effort to consolidate his achievement, Emperor Wendi, as well as his son and successor, Emperor Yang, undertook a series of far-reaching reforms, primarily aimed at standardizing money, reducing social differences among subjects, rebuilding the Great Wall, creating a new administrative system, promoting Buddhism, and what is often considered to be the most important, the completion of the Grand Canal, which first created the North and South China transport links, thus enabling the renewal of cultural ties and nationhood in the following centuries.