How do you make nation an adverb?

Answer 1

The noun nation has the adjective form national and the adverb form is nationally (done in, about, or for the nation). There is another rarely-used adverb, nationalistically (in the spirit of nationalism).

Answer 2

The word "nation" is a noun and cannot be directly transformed into an adverb. Instead, you can use the adverbial form to describe an action related to a nation, such as saying "on a national level" or "acting nationally" to convey the idea of something happening at a national scale.