The Song dynasty ultimately collapsed from too much bureaucracy and its weak military. It was unable to fight off invading tribes like the Khitan and the Jurchen, which invaded north China and forced the Song dynasty to the south. The Mongols then took over southern China in 1279, causing the complete end of the Song dynasty. <ref>http://www.conservapedia.com/World_History_Lecture_Seven</ref> | The Song dynasty ultimately collapsed from too much bureaucracy and its weak military. It was unable to fight off invading tribes like the Khitan and the Jurchen, which invaded north China and forced the Song dynasty to the south. The Mongols then took over southern China in 1279, causing the complete end of the Song dynasty. <ref>http://www.conservapedia.com/World_History_Lecture_Seven</ref> |