"Sumerian city-states fought each other" would be the best option from the list, since this internal division led to a collapse of power that left people without protection or a solid economy.
2
because it is on the border
The Epic of Gilgamesh was the product of the "Sumerian" civilization, since this is considered to be perhaps the greatest and most impactful piece of Sumerian literature.
Answer:
It generates new insights from previous analyses
Feasibility of both longitudinal and international comparative studies.
It saves time.
DISADVANTAGES
Inappropriateness of the data. Data collected by oneself (primary data) is collected with a concrete idea in mind. Usually to answer a research question or just meet certain objectives this sense, secondary data sources may provide you with vast amount of information, but quantity is not synonymous of appropriateness.
