What is the system of fortification built by the french along the german border?

answer: karl marx, max weber, and emile durkheim (the fourth could be considered georg simmel)

explanation:

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.