It was also known as the English civil war
Answer:
Democracy was being gravely threatened.
Explanation:
Hitler had a lot of power and when he invaded France, everyone knew Democracy was in danger.
I believe the answer is Barbed Wire.
Befor the inventions of barbed wire, the Cattles are let to roam freely across the plains and the owners are required to pay a lot of cowboys to supervise them so they didn't go missing. Witht he invention of barbed wire, they can keep the cattle in a secure place without supervision.