expression
as a nation; with the whole country
Used when the entire nation is involved in an effort or event, often in formal or news contexts.
国家を挙げてそのプロジェクトを支援した。
The whole nation supported the project.
国家を挙げて祝うべき出来事だ。
It is an event that should be celebrated by the entire nation.
Similar meaning but uses 国 (くに) instead of 国家 (こっか); slightly less formal and more common in everyday speech.
Phrase composed of 国家 (nation) + を (object marker) + 挙げて (te-form of 挙げる, 'to raise' or 'to mobilize'), literally 'raising the nation'.