What kept the missouri compromise from being a permanent solution? a. trying to spread salvery into the new territories b. trying to grow their economies through agriculture c. building industrial economies based on manufacturing d. finding new ways to increase the availability of slave labor

I think the answer is B

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.