The Black Death is a deadly disease that killed over 20 million people
The Black Death arrived over trade ships in the 14th century
Fleas gave it to the rats on the ship and it started a cycle
Symptoms include: fever, chills, vomiting, diarrhea, aches and pains, and death
So many people died there was a serious labor shortage all over Europe which to workers demanding higher wages; landlords refused to pay them.