It is during the second major working phase that historians ask a big question, since this is phase after the preliminary research as been completed.
The transcontinental railroad allowed for the transportation of goods over long distances. This was especially helpful for the industrial north at the time.
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Answer :main factor was political: 100 years war, turning back to secular power instead of spiritual, religious was conflict of popes with secular power instead of spiritual,. Hard to control economy in all states. Black plague. The papacy was able to dominate kings and secular rulers during the High Middle Ages.
Explanation: good day