What was the "southern song" dynasty?

The Southern Song (Chinese: 南宋; 1127–1279) refers to the period after the Song lost control of its northern half to the Jurchen Jin dynasty in the Jin–Song Wars. ... In 1234, the Jin dynasty was conquered by the Mongols, who took control of northern China, maintaining uneasy relations with the Southern Song.

b: the establishment clause  

b: socialism  

the fact that could also be added to column b is that during world war ii, specifically between the years 1941 and 1945, japan expanded its territory towards the indonesian territory in what was known later as part of the "pacific war". in that time, japan could conquer the philipines, singapore,   borneo, central java, malang, cebu, sumatra and various other islands of the area, therefore expanding its territory for a brief period of time.