As what the map shows, one of the geographical features of West Africa is the Sahara Desert. Sahara Desert is the largest hot desert in the world. Camel caravans are important innovation in trade in West Africa because camels are the only animals that can withstand the hot temperature of the desert while carrying goods, and without food and water. The fat in the camels' humps gave them the energy to walk the desert even without food and water. The camel caravans made the West - North Africa trade possible, establishing trade routes across the hot desert.
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Mongol expansion into Central Asia began in 1209, as the Mongols pursued tribal leaders who opposed Chinggis Khan's rise to power in Mongolia and thus constituted a threat to his authority there. With their victories, the Mongols gained new territory.
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The Japanese Americans joined the military in WW2 to show patriotism and or to get out of an internment camp.
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