The correct answer to this open question is the following.
Evaluate the extent to which the progressive movement fostered political change in the united states from 1890 to 1920.
During a time of many changes in the conformation of the United States, the Progressive movement from 1890 to 1920 was a period where reformations accomplished many things that the American people needed. The most important: to modernize a federal government that needed a "shake and some cleaning," and reformations that improved education and promoted suffrage for women in America. Many journalists started to investigate corruption cases in the government and exposed them in their newspapers. The passage of the 18th Amendment to the United States Constitution was another important piece of legislation in the Progressive Era.
First, trench warfare was developed because the military noticed that they lose a lot of people because they fought in big numbers which led to more deaths when shot with rifles or other artillery. Mainly, because of the failure of the Schiefflen plan, trench warfare came into the picture. Since they were lacking in number and they have to spread in order to defend, they decided to devise a plan of infiltration and give them a surprise attack - but this failed. So, they built trenches to protect the military from being killed en masse.