All of the following are strengths of the internet as a source of information except: a. up-to-the-minute news b. quick facts and statistics c. research done prior to the civil war d. well-known events, individuals, and organizations

It is C.  The reasoning for this is because the internet was not around in times prior to the civil war.  This information is most likely stored in books or other forms of media.  While there is information about the civil war and prior times on the internet, many research projects etc were never published on the internet because it had not been invented.

byzantine empire is the answer i think you are looking for.

hope this : )