During the civil war cotton diplomacy was

Cotton diplimacy refers to the politicLbtactic used by the Confederacy to coerce support for the Confederacy war effort by implementing a cotton trade embargo against the U.K. and the rest of Europe.

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.

a drastic rise in oil prices ended decades of postwar.