World war i: why did the war widen to become a world conflict?

Well, due to Hitler invading many countries, those countries did not have big enough armies to defend their country. So when Britain and France tried to attack, they needed help. Which then led to the US being allies, to join in and provide back up.

Information on the cost of things, quantitative data has to do with numbers, qualitative data uses details such as taste, appearance, what it looks like etc. 

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