The emancipation proclamation
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life or helping out, power
The crusades helped drive some of the seljuk Turks out of the area, but (according to Wikapedia) "It also opened up byzantium to Latin aggression which was not always dedicated to Byzantium's enemies"
Also, the Fourth crusade (made up of Latin crusaders) sacked Byzantium and greatly reduced power in the empire.
C . The oldest accurately dated star chart appeared in ancient Egyptian astronomy in 1534 BC. The earliest known star catalogues were compiled by the ancient Babylonian astronomers of Mesopotamia in the late 2nd millennium BC, during the Kassite Period
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