Taiwan is the East Asian country that is currently threatened by the expansion of its desert in its western region.
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River valley trade made them key economic areas.
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The Saudi Arabia politics are take place in the context of a totalitarian absolute monarchy with some Islamic (Wahhabi Islam) lines, and the King is both the Saudi Arabia's head of state and absolute monarch (i.e. he is the head of government). The King also serves as the head of the Saudi royal family, the House of Saud, which is also why the country bears the name that it has.