Irrigation of crops led to salinization of the soil, Sumer was located on a flat plain that provided no natural barriers to invasion, and the land became too swampy to grow adequate crops.
The answer is c mississippi ,ohio , and missouri
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In the decades since the Holocaust, some national governments, international bodies and world leaders have been criticized for their failure to take appropriate action to save the millions of European Jews, Roma, and other victims of the Holocaust. Critics say that such intervention, particularly by the Allied governments, might have saved substantial numbers of people and could have been accomplished without the diversion of significant resources from the war effort.
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A an agreement between Britain and the United States to end the War of 1812
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The Treaty of Ghent was the peace treaty that ended the War of 1812 between the United States and the United Kingdom.