In the first year of the Tang Dynasty (88 1), Tuoba Sigong occupied Zhou Xia (now Hengshan County, Shaanxi Province), which made it difficult for us to recover time and made Xia Guogong independent from generation to generation. A.D. 1038, when the People's Republic of China was founded, it was named "Daxia" with Xia as its title. Because in the west, the Song people called it "Xixia".
The territory includes present Ningxia, northwest Gansu, northeast Qinghai, Inner Mongolia and northwest Shaanxi. There is the Yellow River in the east, Yumen in the west, Xiaoguan in the south (now Tongxin South in Ningxia) and desert in the north, covering an area of more than 20,000 li.
To sum up, Xixia belongs to China!