The wilmot proviso, if it had passed, would have allowed slavery in any area of the united states gained canada from the british prohibited slavery in any lands acquired from mexico made mexicans and american indian slaves alongside blacks, in the territory acquired from mexico

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.