They both orbit around the sun. They both have moons, rings, and colored bands. They both have gas giants.
A biggie: the transcontinental railroad. Because it would economically improve wherever it was, both the North and the South competed for the railroad to be in their respective territory, evidenced by the Kansas-Nebraska Act and the Gadsen Purchase and induction of California as a free state in 1860.
In addition: people could get land cheap because it was abundant and might leave to start afresh economically.
There's other stuff I can't remember as clearly, but there's a little and I hope it helps :)
C maybe she wanted to keep them safe
A. A was deposited most recently in the diagram above, as it is located in the top, showing that is the newest layer to be added.
Answer:
Proper cleanliness of water..
