When was the han dynasty established?

206 BCE

The Han dynasty was founded in 206 BCE by Liu Bang, who led the revolt against the repressive policies of the preceding Qin dynasty and became the Gaozu emperor (reigned 206–195 BCE).

couples could only have one child to reduce the population growth.

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.