The correct answer is highways
Highways became revolutionary a hundred years later, in the twenties of the 20th century. This is when the German autobahn was being built, for example, and also in the US it started with acts made in the twenties as well. Highways did not exist in the late 1800s but rather in the second decade of the twentieth century.
Mesopotamia was known for being in vicinity to the Tigris and Euphrates Rivers. This allowed them to use an extensive amount of trade routes to modern day Turkey and Iran, as well as getting closer to where Asian and European traders were.
This, in turn gave them access to resources that they otherwise would not be able to find in their own territory, such as certain metals and wood.
Manumission was banned in the South after 1800 because the whites feared that the free blacks would seek revenge for the past treatment.
Manumission is the deed when a slave owner frees his or her slaves. This practice differs from place to place.
Between France and England.( Britain)
A difficulty that had to be overcome during the building of the Transcontinental railroad was Native raiding on work camps.