Why was Wilma Rudolph unable to walk for 8 years in her childhood? Why is that significant?

What period of history refers to the time when people did not have written records

Quick using the information in the graph, one might speculate that a) w.w.i created increased job opportunities in the u.s. b) the election of president hoover in 1936 caused unemployment to decline. c) the return of soldiers following w.w.ii caused unemployment to increase in the u.s. d) the new deal programs of president roosevelt created employment opportunities in the u.s.

Any study/memorization tips? i have exams in a week and it would be great to try suggestions!you ; )