<span>The changing culture brought about social unrest. or
The shifting borders created new political and cultural boundaries</span>
Your answer is Solon. I hope this helps! (:
Is this multiple choice? If not, i'd say that it is important for a historian to be sure of the authenticity of a primary source because a primary source needs to be proven to be accurate. It is important to study and make sure the source is authentic because the accuracy must be proven
