Why has the number of executive departments increased

When things happen, and more problems arise they start hiring new people for more help.

Explanation:

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I believe the answer is: a. Most Europeans are employed in the mining industry.

The most employees during that time work in either railroad and automobiles industry. Since a lot of them used product from the mining industry, people often mistake them. The industry started to shifted from railroad into textile and consumer goods in the mid 1900s.