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Restore (a nation)
liberate (a nation or a people)
restore the political power of (a nation)
reestablishment of (political power or government)
Example: liberation of France in 1944, restoration of the French Republic.
An interesting word that you may want to know: irredentism (Please find and understand the special meaning of this word before you use it.)
Zionism is, usually, only applicable to Jews, for many of them believed strongly in establishing a nation as it is promised by their God.