Coolidge's administration was marked by: a continuation of the post–world war i economic slump. continued tax breaks for the lower and middle classes at the expense of the upper class. prosperity. the creation of the internal revenue service, which drastically reformed taxation formulas and duty lists. a slow economic downturn.

other sources of text

explanation:

this can be magazines, news reports, scholarly articles, textbooks, research papers etc.

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.