MAP 13.1East Asia in 1000 and 1200The Song empire did not extend as far as its predecessor, the Tang, and faced powerful rivals to the north — the Liao Dynasty of the Khitans and the Xia Dynasty of the Tanguts. Koryŏ Korea maintained regular contact with Song China, but Japan, by the late Heian period, was no longer deeply involved with the mainland. By 1200 military families dominated both Korea and Japan, but the borders were little changed. On the mainland the Liao Dynasty had been overthrown by the Jurchens’ Jin Dynasty, which also seized the northern third of the Song empire. Because the Song relocated its capital to Hangzhou in the south, this period is called the Southern Song period.> MAPPING THE PASTANALYZING THE MAP: What were the countries of East Asia in 1000? What were the major differences in 1200?CONNECTIONS: What connections do you see between the length of their northern borders and the histories of China, Korea, and Japan?