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Who was in charge of american troops during world war i?

One drawback of voluntary trade is that it a.requires two groups to use a common language b.can make one group dependent upon another for necessary goods c.doesn't occur unless there is a shortage of goods for at least one group d.forces groups to rely on themselves to produce all the goods they need

What war was a result of militarism and nationalism in the late nineteenth and early twentieth centuries? question 1 options: civil war revolutionary war world war i cold war