“Milestones in the History of U.S. Foreign Relations” has been retired and is no longer maintained. ... bolster the idea that the United States should isolate itself from troubling events in Europe.
Unhygienic conditions, dehydration, dysentery
Answer:
<h3>Polo traveled extensively with his family, journeying from Europe to Asia from 1271 to 1295 and remaining in China for 17 of those years. Around 1292, he left China, acting as escort along the way to a Mongol princess who was being sent to Persia.</h3>
D. Since the North was able to blockade ports, they prevent the south from exporting cotton, their most valuable product, which crippled the South's economy.