In what way has the spread of coal-powered factories been characteristic of the modern era

Modern era or period refers to a time after post-classical history. It can be divided in the early era (16 Th. century) and late modern era (18 Th. century).

Some examples of historical facts in the late modern era are American, French and Russian Revolution and the Industrial Revolution.

The spread of coal-powered factories has been characteristic of the modern era because coal was used to heat buildings, generate electricity and for steam engines. It generates energy for industry and transportation.  

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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.