What did the song dynasty invent in transportation?

that's it.

During the Song Dynasty there were canals built that connected to the main rivers. The compass was also invented and they used it for navigation.

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.

it proved indian land claims were unjustified.