The excerpt of ronald reagan's speech uses an allusion to a past even. this strategy meant to

"Tear down this wall!" is a line from a speech made by U.S. President Ronald Reagan in West Berlin on June 12, 1987, calling for the leader of the Soviet Union, Mikhail Gorbachev, to open up the barrier which had divided West and East Berlin since 1961.

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the conditions that made the byzantine empire vulnerable to attacks by the muslin turks were the sack of constantinople by western crusaders, the conquests of the sultanate of rum, presence of rival kingdoms and finally the set up of fiefdoms at the empire which were owned by the ghazis (turkish warriors).