Analysis of test questions: This small question examines the era of coexistence of ethnic regimes. During the Song Dynasty, the strength of the Central Plains dynasty was weak, unable to complete national reunification, and the northern ethnic regimes coexisted. Liao was founded by Baoji in 9 16, with its capital in Beijing. In 960, the Northern Song Dynasty was established in Zhao Kuangyin, Song Taizu, with Kaifeng as its capital. Xixia was founded by the Tangut leader Yuan Hao in 1 138, and its capital was Xingqing. There was a situation of peace and war between Liao, Xixia and Northern Song Dynasty. The Jurchen nationality oppressed by Liao, led by its leader Akuta Wan Yan, fought against Liao and proclaimed themselves emperor in Huining in115. The title of Jin, together with Jin of 1 125, wiped out Liao and Jin of 1 127.