BEFORE WE START: Sectionalism has quite a few definitions. I don't know what it means, but I'm willing to do some research and provide you with the best definition.
DEFINE SECTIONALISM: →When you are loyal to someone's region or their section of a country (if they're not "over" an entire country). →"Undue concern with local interests or petty distinctions at the expense of general well-being" -Google
WHY TWO DEFINITIONS? This word could mean a few different things depending on how you use it, so I'm going to leave it up to you to find out which definition you want to use.
it is asking to explain one way that scholarly disciples not recorded in history have contributed the perspectives explained by Diamond. (who im presuming is the author)
Innocent: free from guilt; free from legal fault. This should not be confused with the term “not guilty.” Not guilty is a verdict by a judge or a jury that a person accused of a crime did not commit it or that there is not enough evidence to prove beyond a reasonable doubt that the accused committed the crime.