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To increase the size of an army to get ready for a war the country will set a draft to get more people.

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Before waging a war the other country will give a belligerent/warning to the opposing country.

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In a ultimatum it's a deadly deal basically saying do this or else.

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This basically means to unify.When different nations have the same language they would unify together.

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In the military there is a process of how things work. To get ready for a war you need troops and supplies.This process is mobilization.