Thank you for the opportunity to help you with your question!
sometimes the nation and state are used interchangibly
"A state is an organized community living under a unified political system, the government" .
This is basically just a community (usually in a specified territory) that was ruled by a specific government.
A nation may refer to a community of people who share a common language, culture, ethnicity, descent, or history.
Note that a nation has no required geographical tie-in . But they must/should, as a rule,
share history, culture and language
The idea of a nation and a state being the same thing ("Nation-state") is fairly new in modern politics (it came about as one of the consequences/results of Peace of Westphalia, which ended the 30-year-war in Europe
Please let me know if you need any clarification. I'm always happy to answer your questions.