What new
nations have been added to the
map?

actually there are now less so there is no new nations added

Explanation:

some small countries combined and became modern day countries

i really really really really really really dont know

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.