1794, "invest with a national character;" see national + -ize. Probably inspired by French nationaliser, noted by 1795 as one of the coinages of the Revolution. Meaning "bring under state control" is from 1869. Related: Nationalized; nationalizing.
Mitterand nationalized the banks
His heroic deeds were nationalized by the press
national
nationalism
nationalist
nationality
nationalization
nationalize
nationhood
nationwide
native
nativeness
nativism