The Grand Canal was a technology and public project under Yangdi that helped unite China, but it should be noted that there were other things as well.
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The answers are
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19) <
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21)
A. Eleanor of Aquitaine
Neither Charlemagne, Joan of Arc nor Henry II were alive at the time of the third crusade, so they cannot be the correct answer. Eleanor of Aquitaine was Richard I's mother and she was well known for her political influence, and she did help rule England while Richard I was away, therefore (A) is the correct answer.
Answer:
George Calvert, John Oglethorpe and John Smith
Explanation: