Attack on Pearl Harbor Creation of the Manhattan project

D-Day

Executive order 9066

Fall of Berlin (surrender of Germany)

Hiroshima

Lend-lease program

Midway

Nagasaki

Outbreak of WWII in Europe

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