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A- Shays’s Rebellion exposed the weakness of the government under the Articles of Confederation and led many—including George Washington—to call for strengthening the federal government in order to put down future uprisings.
Roman’s officials laws were responsible for making sure that people followed them. At first these laws were the patricians who had made them.
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.