Puerto Rico was neither a state nor a territory. However, the Foraker Act of 1900 granted a limited degree of popular government to the Puerto Ricans. Puerto Rico is still an American territory today. What other territories did America acquire during this era? Why were they desired?

I don't know sorry I hope you find what your looking for

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 system of cooperative federalism emerged, as the powers of the federal government expanded.