Source : Webster's Revised Unabridged Dictionary (1913)

Territorialize \Ter`ri*to"ri*al*ize\, v. t. [imp. & p. p.
   {Territorialized}; p. pr. & vb. n. {Territorializing}.]
   1. To enlarge by extension of territory.

   2. To reduce to the condition of a territory.

Source : WordNet®

territorialize
     v 1: organize as a territory [syn: {territorialise}]
     2: place on a territorial basis; "The railways were
        territorialized" [syn: {territorialise}]
     3: extend by adding territory [syn: {territorialise}]