ONE specific historical effect of the changes in United States energy sources between 1850 and 1900 is that there is a lot more coal than there was in the 1900

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.

b) almost one million irish people died during the potato famine.