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I believe it's from non-interventionist to interventionist.
During the cold war period, the Soviet Union tried to spread communism influences throughout the world by giving supplies and weapons to conflicted nations in order to gain an ally.
Because of this, united states believe that they need to start making intervention for global conflicts to prevent communism from gaining dominant control in the world affairs.
well there were already individual tribes building walls so Han said why not build a bigger one to protect all of china
Was the main motivation for the Europeans Diamonds
Problems created by the Treaty of Versailles and the Great Depression led to the rise of the aggressive states that sought to conquer their neighbors.