What stroke of good luck made the building of the Athenian navy possible?

How did the new working class of the industrial revolution differ from the working classes of the earlier, farm based economy?

The supreme court settle conflicts between the various levels of government true or false ?

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