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Rome did not have a good system of succession. Rulers were not chosen carefully and that lead to major problems throughout Rome. Almost all rulers of Rome were murdered by either in cold blood or by poison. The next ruler had the same fate. Almost every ruler survived for no more than 2 years.
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Hey there!
Similarites- Organized Government, Food supply
Differences- Labor, and paganism
Hope this helps!
External criticism is very important when it comes to analyzing data, because as a researcher it is possible to get too "close" to the data, in that one can stop being objective and start looking for ways to match the data to the desired results.