War of total attrition
Yes it can.
A person who goes to war is called a soldier. They may be a volunteer or a draftee, but they are still a soldier.
To protect their country.
Argentina - Falklands War
no country wants to go to war
A person who leaves a country to go live permanently in another is called an emmigrant,
Austria-Hungary
Brinkmanship
Anyone can declare war on another country. That does not mean all will follow you, nor make it 'legal', if that has any meaning here. It is of course also possible to declare war on your own country, the tragic results of which are there for all to read.For a country to declaring war on another country is a different matter, it would take the ruling government to decide to go to war. There may be provisions for it within documents or simply the authority of the ruling party or person.Usually only the President, Prime Minister or Cabinet of a country can declare war
Cold War?
It could take just a few seconds for a country to go into a civil war.
Great Britain