How do the constitution and its amendments reflect the political principles of rule of law checks and balances separation of powers republicanism democracy and federalism

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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

Which part of the present day united states did zebulon pike explore during his second expedition