I think all are important, but I do believe paper has lasting importance. This is said because in present day we use other things then wheel barrows to store stuff, and we have boats and ships that are not steered by rudders. No one uses compass because of phones and seismometers are usually only used if your a seismologist. Paper is a daily everyday thing that people use.
The drawings, in turn, may represent the sounds that early humans generated in those spots. ... Cave artists were thus not just early-day Monets, drawing impressions of the outdoors at their leisure. Rather, they may have been engaged in a process of communication.
Answer and explanation;
-Most African Americans weren't allowed to join the army due to segregation thus, most of them moved to the factories north to help in any way possible by building weaponry and such.
-The desire of black Southerners to escape segregation was a major cause of the great migration, known euphemistically as Jim Crow. Rural African American Southerners believed that segregation - and racism and prejudice against blacks - was significantly less intense in the North.
Although Aurangzeb expanded the Mughal empire to its greatest extent, his wars were not as successful as he hoped. He failed to totally defeat the Marathas to the south, the Sikhs in the Punjab and Persia to the west. His wars cost an enormous amount of money, and basically bankrupted the state.
The answer is either Ethnic, or social. I'm not too sure, but I'm leaning towards Ethnic. Hope I could help!