To pull themselves out of their feudalism economy and increase their wealth and power. there were a lot of second and third sons becoming merchants after their older brothers inherited the land, and these merchants had more to trade than what people inside europe needed so they increased their trade outside their nation.
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A constitution is an aggregate of fundamental principles or established precedents that constitute the legal basis of a polity, organisation or other type of entity, and commonly determine how that entity is to be governed
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Answer:
Primary sources, because they can be more accurate about a certain incident or event.
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Actually every single one is correct, A<B<C they all are factors in the decline of Sumer.