What are the key features of World War One? (research help)

I need to write an essay about my great grandfather being in world war one and i need the key features of world war one? Any help? please

Have you tried to research this subject online? There are many websites that explain in detail the causes and happenings during the war. Maybe you could watch a short documentary that would talk about the war and what exactly occurred. If you are writing about your great grandfather, I would surround the paper around his involvement in the war. Explain the jobs he performed, and how the US military affected the events and outcome of the war. Be sure to tie in his work with the crucial moments of the war. This will make the paper really interesting, to follow one man's story, no matter how small, and show it as a reflection of the war as the big picture. Once you have something written, there are many of us here who would be happy to review your paper. Even if you have a short essay, or a rough draft, somebody is bound to review it. Good luck :)

In my opinion,perhaps it is not so important about the social backgroung. I come from Honkong, a place directly influenced by the WW2, so I have read a lot of works about the influence of the war. Some distinguished works even do not show any scenes about the war. They just use the emotions and attitude of the people whose relatives come to the battleground and their daily life, seemingly totally unrealted to the battlefield but in fact tightly connected with it, to reflect the war. So, I think you can focus on how your grandfather's family replied to his conscription , how they think about your grandfather, and how their lives have been influenced by your grandfather's abscence from the family.