What are some examples of how Muslim nations in the Middle East had a major economic influence on western Europe?

Public opinion is difficult to define

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

Can you describe the american army in 1812?