There was tension in the politics of the nation which were largely due to differences in the economies of the North and the South. For the South, slavery was used as a labor source hence they supported slavery. The North on the other hand was opposed to slavery as it was largely urbanized. Different regions led to the creations of different economies.
The correct answer is letter A. Rome was located on a large river that is why they built aqueducts and sewage systems that eventually paved the way for their great civilization. Water is the main source of agriculture, building, and health for the Romans. Today, a lot of the innovative machines we have are influenced by the Roman Empire.
I believe your answer is C correct me if I'm wrong. I hope this helps
<span>By gradually building up the sea power of the US Navy.</span>
