What does corroborating sources allow a historian to do

Corroborating sources allow historians to prove their system of hypothesis, and to generalise about some events, because they found factual evidence to sustain their research. It's an important subject, because historians have the challenge to prove hypothesis that are based in social evidence that usually take place in the past.

most people such as me i dont have one but if   i did i would mostly likely quit my job if the economy was down cylcling that means less money if you go to a bigger job that is prospering you can earn more wage and still be able to feed yourself or why you work all people want more money then they have guarteed most people like me would switch jobs for a better one with higher wage