Answer:
One of the saddest facts about World War I is that millions died needlessly because military and civilian leaders were slow to adapt their old-fashioned strategies and tactics to the new weapons of 1914. New technology made war more horrible and more complex than ever before. The United States and other countries felt the effects of the war for years afterwards.
The popular image of World War I is soldiers in muddy trenches and dugouts, living miserably until the next attack. This is basically correct. Technological developments in engineering, metallurgy, chemistry, and optics had produced weapons deadlier than anything known before. The power of defensive weapons made winning the war on the western front all but impossible for either side.
D.) assembly line process of production.
The answer to this question is : Only kings and their relatives could become royalty, while effective military leaders and politicians could become nobles
