I think it was called a citizen's army because when citizens came together to form a 'army' the normal army, and other countries, referred to them as a 'citizen's army'
Hope this helps! :)
Secondary sources would be valuable to a historian in order to provide "c) a more thorough analysis of the impact on history of an event."
Your answer would be D) Time zones created a standard of time that all trains followed! Hope this helps! :D
Great Britain, funny how this question has been asked many times according to google lol