What does the Northern and Southern Song Dynasty mean? Did the north immigrate to the south?

Kaifengfu, the capital of the Northern Song Dynasty, was established by Zhao Kuangyin and used to be the capital of Tokyo. In the twenty-five years of Huizong in the Northern Song Dynasty, the society was in chaos, landlords lent usury, and six thieves plundered the people's money paste. Jin Taizong took the opportunity to send troops to attack the Northern Song Dynasty. Although Li Gang defended Tokyo to the death, he was exiled to Yangzhou by the capitulators. As a result, Emperor Taizong of Jin sent troops to attack the Northern Song Dynasty, destroyed it and killed Song Huizong, Song Qinzong, the queen and concubines. Zhao Gou, the son of Princess Song Huizong, fled to the south without being caught.

All the north of the Yangtze River fell, because the Song Dynasty he founded was in the south, so it was called the Southern Song Dynasty in history.

In 960, Zhao Kuangyin, a general of the later Zhou Dynasty, established the Northern Song Dynasty, with Kaifeng as its capital.

In 1 125, Emperor Taizong of Jin sent troops to attack the Northern Song Dynasty, captured Song Huizong and Song Qinzong, and destroyed the Northern Song Dynasty.

In the Northern Song Dynasty, Kaifeng was destroyed by the State of Jin, and Song Qinzong's younger brother Zhao Gou fled to the south and moved to Lin 'an, which is known as the Southern Song Dynasty.

The territory of the Northern Song Dynasty is larger than that of the Southern Song Dynasty. After the demise of the Northern Song Dynasty, the Southern Song Dynasty opposed the Jin Dynasty, and the two countries took the Great Three Pass-Huaishui as the dividing line.