Why would a pope threaten to excommunicate a king?

Popes used the threat of excommunication, or banishment from the Church, to wield power over political rulers. For example, a disobedient king's quarrel with a pope might result in excommunication. This meant the king would be denied salvation. Excommunication also freed all the king's vassals from their duties to him.

first industrial revolution - the first wave of the industrial revolution lasted from the late 1700s to the mid-1800s. it industrialized the manufacture of textiles and began the move of production from homes to factories. steam power and the cotton gin played an important role in this period.

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