Describe 3 factors that contributed to the start of the Black Plague pandemic

Historians have identified several key causes, including: rats, trade networks such as the Silk Road, warfare such as the crusades, poor hygiene and a lack of medical understanding.

Explanation:

They know that the bacillus travels from person to person through the air, as well as through the bite of infected fleas and rats. Both of these pests could be found almost everywhere in medieval Europe, but they were particularly at home aboard ships of all kinds—which is how the deadly plague made its way through one European port city after another. The plague is thought to have originated in Asia over 2,000 years ago and was likely spread by trading ships, though recent research has indicated the pathogen responsible for the Black Death may have existed in Europe as early as 3000 B.C.

Explanation:

my source:

https://www.history.com/topics/middle-ages/black-death

china has confucianism thats everywhere in asia but it isn't really a religion.  

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explanation: