They were among the first to develop a system of uniform weights and measures. Their building bricks w<span> This was the first civilization to incorporate urban sanitation systems. Personal hygiene seems to have been a high priority. </span>ere very uniform making city planning easy. <span> Transportation and trade were major goals of these people. Their trade network ran from Mesopotamia to northern and central India. Their empire was economic, not military. </span>
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How has the internet helped elected officials to communicate with the American citizens? They help bring attention to unpopular or unknown topics. How do third parties have a positive effect on national politics?
Explanation:
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Only the federal government can sign treaties.
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