Original sentence: Later, the east south of Manchuria became a border issue between the Korean Dynasty,Chosun Dynasty, and Qing Dynasty; the issue was once agreed in the early 18th century but was brought up again ,in the middle 19th century, in translating the border-monument;a fact that the border-river is a branch of Songhua River and still remain a controversial.The conference or submit was broke off and delayed off in the 19th century