Source : Webster's Revised Unabridged Dictionary (1913)

Federalize \Fed"er*al*ize\, v. t. [imp. & p. p. {Federalized};
   p. pr. & vb. n. {Federalizing}.] [Cf. F. f['e]d['e]raliser.]
   To unite in compact, as different States; to confederate for
   political purposes; to unite by or under the Federal
   Constitution. --Barlow.