The correct answer is - trade.
The Sumerians engaged in trade with their move of exchanging their surplus food for materials like the copper that they needed to develop their weapons and thus their army forces. This was a very smart move from their side because they managed to use the resource they had in abundance but was scarce in the other surrounding areas so that they take what they need to become stronger and pretty much defend more efficiently from the same people they were engaging in trade with.
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Hope i helped ;)
It may not seem that the Triangle Shirtwaist factory fire, which happened over a century ago in New York City, would be relevant today — but it is. It was a tragedy that opened the nation's eyes to poor working conditions in garment factories and other workplaces, and set in motion a historic era of labor reforms.Mar 25, 2014
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The French People unseated the monarch Charles X
