Answer:
The diffusion of crops and pathogens, including epidemic diseases like the bubonic plague, often occurred along trade routes.
The bubonic plague - named the Black Death by later historians - was caused by the Yersinia pestis bacteria, which lived in rodent populations and was spread by fleas that had bitten infected animals.
Once the plague transferred to animals that were in close contact with humans and to humans themselves, it began to spread along established trade routes.
It is difficult to measure the exact human cost of the plague due to limited records from the historical period.
Most historians think that the plague killed somewhere between 30% and 60% of Europe’s population between 1347 and 1351.
Explanation:
I believe the correct answer is D.
The Battle of Saratoga did not allow the British to cut off New England from the rest of the colonies.
British general John Burgoyne had proposed the plan to isolate New England from the rest of the colonies. The plan had about 8,000 British troops invading into New York from Canada and taking control of the Hudson River. The plan was initially successful -- the British took Fort Ticonderoga in June of 1777. But General Burgoyne overextended his access to supplies as he came further into Patriot territory, and the colonial forces were able to cut off his supply line. After a couple of difficult battles, Burgoyne's eventual surrender of his troops came with the loss at Saratoga in October, 1777.
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