Because they need food and water to survive on their journey in North America
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While droughts can have different causes depending on the area of the world and other natural factors, the majority of scientists have started to link more intense droughts to climate change. That’s because as more greenhouse gas emissions are released into the air, causing air temperatures to increase, more moisture evaporates from land and lakes, rivers, and other bodies of water. Warmer temperatures also increase evaporation in plant soils, which affects plant life and can reduce rainfall even more. And when rainfall does come to drought-stricken areas, the drier soils it hits are less able to absorb the water, increasing the likelihood of flooding – a lose-lose situation.
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Droughts are among the most expensive weather-related disasters in the world (pdf), affecting ecosystems, agriculture and human society.
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The Second Balkan War On June 1, 1913, Serbia and Greece formed an alliance against Bulgaria, and the war began on the night of June 29–30, 1913, when King Ferdinand of Bulgaria ordered his troops to attack Serbian and Greek forces in Macedonia.
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David was 30yrs old when he became King and ruled for 40 years
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