Great britain formed when
a. the english took control of the american colonies.
b. ireland and england united.
c. the english colonized india.
d. scotland joined england.

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