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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 spread of coal-powered factories has been a hallmark of the modern era, as coal was used to heat buildings, generate electricity, and power steam engines. It provides power to industry and transportation.

What was the modern era?

The modern era or period refers to the post-classical history. This period was divided in the early era 16th century and later modern era 18th century. The late Middle Ages of the post-classical era are followed by the early modern period of modern history.

The Coal was used to heat buildings, generate electricity, and power steam engines in the modern era. It also provides power to industry and transportation.

Learn more about the modern era, refer to:

https://brainly.com/question/8858796

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