The third one, Gerald Ford
In response to the Berlin wall the United States created the Berlin airlift. Supplies were sent on planes and dropped into Berlin. These supplies included things such as food and water.
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.
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It affected their social lives, and there was very little trade between the two regions (the only ones around.) They also needed many people. They developed irrigation and drainage systems which caused many people to work.