It would be "industrialization," that was a significant factor in both the german wars for unification and United States' Civil War, since Industrialization led to an irreconcilable economic split between two more major segments of each area.
<span>Increase in social stratification</span>
Answer: Military rulers take control in japan during the Great Depression
Transportation became faster and cheaper
<span> a revolution in communication occur in the 15th century
The first revolution in communication happened after Johanne Guttenberg developed the first movable printing in 1439, which allow people to easaily write and exchange information from one place to another</span>