What does federalize mean?
Federalize is a verb meaning to unite separate states, provinces, or organizations into a single system governed by a central federal authority, or, particularly in the United States, to place something under the direct control of the national government. Its most prominent use concerns political structures: independent states may federalize by adopting a shared constitution that divides power between central and regional governments, as happened with the American states after independence. In American usage, the term also has a precise legal application — the president may federalize a state's National Guard, transferring it from gubernatorial to national command, a power invoked at historic moments such as the 1957 Little Rock desegregation crisis. Formal and largely confined to political and legal discourse, the word carries connotations of consolidation and centralized authority, and it often surfaces in debates about whether institutions such as the European Union should become more fully federal.
To unite states, provinces, or organizations into a federation under a central governing authority.
"The newly independent cantons voted to federalize rather than remain separate republics."
Often used intransitively ('the states federalized') as well as transitively ('they federalized the states').
(US) To bring under the jurisdiction or control of the federal government, especially state military forces.
"The governor resisted attempts by Washington to federalize her state's troops."
In 1957, President Eisenhower did something no president had done since Reconstruction: he federalized the Arkansas National Guard — taking it out of a governor's hands — to protect nine Black students integrating Little Rock's Central High School.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of federalize
Federalize derives from 'federal', which comes from Latin 'foedus' (stem 'foeder-'), meaning 'treaty' or 'league'. The adjective entered English in the early 17th century via French 'fédéral' and the verb was formed later with the '-ize' suffix, common for verbs meaning 'to make or become'. It shares its Latin root with related terms such as 'federation', 'confederate', and 'foedus'-derived words like 'confide' is unrelated — but 'confederacy' and 'feud' (via medieval Latin 'feodum') show how the root spread across political vocabulary.
Related word forms
How federalize is actually used
The word is largely formal and political, appearing mainly in discussions of constitutional law, governance, and American political history. In US usage it carries a specific technical sense regarding the National Guard; in broader international contexts it typically refers to forming federations, as in debates over a 'federalized' Europe. The British spelling is 'federalise'.
Easily confused with federalize
'Federalise' is simply the British English spelling of the same verb, differing only in spelling convention.