Answer:
Aqueducts
First developed around 312 B.C., these engineering marvels used gravity to transport water along stone, lead and concrete pipelines and into city centers. Aqueducts liberated Roman cities from a reliance on nearby water supplies and proved priceless in promoting public health and sanitation.
Concrete
Many ancient Roman structures like the Pantheon, the Colosseum and the Roman Forum are still standing today thanks to the development of Roman cement and concrete. The Romans first began building with concrete over 2,100 years ago and used it throughout the Mediterranean basin in everything from aqueducts and buildings to bridges and monuments. Roman concrete was considerably weaker than its modern counterpart, but it has proved remarkably durable thanks to its unique recipe, which used slaked lime and a volcanic ash known as pozzolana to create a sticky paste. Combined with volcanic rocks called tuff, this ancient cement formed a concrete that could effectively endure chemical decay. Pozzolana helped Roman concrete set quickly even when submerged in seawater, enabling the construction of elaborate baths, piers and harbors.
Ideology
I guarantee you that is the word.
A Political Ideology is a certain set of ideas, principles, or symbols of a political party.
Example: The Republican party's ideology involves less government control of people's lives. That is why Republicans are less likely to support restrictions on guns.
The Sahara Desert covers large parts of Algeria, Chad, Egypt, Libya, Mali, Mauritania, Morocco, Niger, Sudan, and Tunisia it also is located within the Occupied Territory of Western Sahara. It is an expansive desert that covers almost the entirety of North Africa and serves as a natural divide in the African Continent.
D) The rise of Jim Crow laws in the South.
Explanation:
By the beginning 1870s, sharecropping was the procedure adopted which was recognized to control cultivation beyond the South-land which was cotton-planting areas.
Under this system, black population groups will be permitted to utilize small plots of land, or employment, to work themselves in recovery, they would give a portion of their harvest to the landowner after the year.