This dimension groups energy pioneers by nationality. Wikipedia defines nationality as "the legal status of belonging to a particular nation." Browsing this way collects every pioneer from the same country.
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Era of Emergence Canada
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Sources
1. Coal mining - Wikipedia
WikipediaHistory, coal mining industrial importanceQuote, History, coal mining industrial importance
It became important in the Industrial Revolution of the 19th and 20th centuries, when it was primarily used to power steam engines, heat buildings and generate electricity.
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