state of unrest vs upheaval

state of unrest

upheaval

noun
  • Disruptive change, from one state to another. 

  • A sudden violent upset, disruption or convulsion. 

  • The process of being heaved upward, especially the raising of part of the earth's crust. 

How often have the words state of unrest and upheaval occurred in a corpus of books? (source: Google Ngram Viewer )