If you want to discuss the evolution of the nation state and European wars you want to go back to at least the 16th century with the emergence of powerful monarchs with consolidated territory looking to secure and expand their rule (and chasing ever increasing global spoils).
Simplified difference: A nation does not have to be a state. Quebec is a nation. Canada is a state. A state does not need to be a nation. Czechoslovakia was not a nation. It was a state.
If you want to discuss the evolution of the nation state and European wars you want to go back to at least the 16th century with the emergence of powerful monarchs with consolidated territory looking to secure and expand their rule (and chasing ever increasing global spoils).
http://www.youtube.com/watch?v=I5YZ7FELtCI
Simplified difference: A nation does not have to be a state. Quebec is a nation. Canada is a state. A state does not need to be a nation. Czechoslovakia was not a nation. It was a state.