The plague had killed a third of Europe , and in Italy the feudal system had broken down , forcing vulnerable city-states into open conflict .
Europe /location/location/contains Italy
DT VB VBD VBN DT JJ IN NNP , CC IN NNP DT JJ NN VBD VBN RP , VBG JJ NNS IN JJ NN .
Europe
LOCATION
Italy
LOCATION
/location/location/contains