i think it might be C but i'm not absolutely sure
I don't see the things i am supposed to check, but i will still answer your question. The most important reasons why WW1 started was because of Militarism, Alliances, Imperialism, and Nationalism.
Answer:
A.
Explanation:
Displaced persons camps are used today as well. They are sometimes referred to as "refugee camps".
Honestly the graph doesn't show anything about technology. the only thing i could think of was something close to technology is factories. the north will have more impact on technology than the south that's only cause north makes more money than the south does to have technology. i hope this helps