Of the following government types, which two are the most opposite?

During the era of european expansion, what was the biggest reason for spain’s push for exploration?

In 1819, what did the united states obtain from spain for $5 million?

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