The Christian calendar was introduced in Rome only when the converted to Christianity. This system of dating is still used internationally. Using a
dating system makes it easier to mark and compare historical events.

- "the past is made of multitudinous items ranging from anything that can be collected, recollected or assessed to originate in the past. as such, the past is a gallimaufry of particulars that may not have been related in any way. however, the human mind seeks organization to understand concepts and other things. the human mind therefore seeks relationships in explaining and studying the past. history being a humanity, dictates that historians have to serve this human trait by bringing structure to details of the past. historians do this by creating interpretive frameworks that capture as many details as possible."

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typical characteristics of global cities include all of the following except being culturally isolationist.

explanation:

a widespread disease that killed many people

the split of the christian church

invasion from arab muslims