What did America gain from the Adams- Onis Treaty ?

Which group was responsible for determining the borders of african colonies and later countries

The explorer marco polo who visited china was from barcelona luxembourg rome venice

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