decentralize vs unify

decentralize

verb
  • To cause something to change from being concentrated at one point to being distributed across a number of points. 

  • To reduce the authority of a governing body by distributing that authority among several bodies. 

unify

verb
  • Cause to become one; make into a unit; consolidate; merge; combine. 

  • Become one. 

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