The answer is actually Complex drainage systems to keep structures from flooding.
I think it’s c but I could be wrong
The impact that the spoils system had on the US Government was not good. It came into effect after Andrew Jackson awarded government positions to his supporters in the election of 1828. Many important positions in the government were held by nobodies who had little or no experience it politics.
<span>The correct answers are B. A moat filled with water from the Euphrates River surrounded the city, and
C. Walls around the city provided protection from enemies. This was copied later by many cities beacuse it was successful. Cities would dig deep trenches and holes around the city and fill them with water and you wouldn't be able to enter without crossing the bridge that may or may not be lowered for you. </span>
I think a. the ban on slavery was blamed for slow economic growth , and slavery became legal in 1750.
