Explanation:
one god.
They worshipped one god, not many gods.
They were the first people to allow women to serve as rulers
They were the first people to ban the eating of certain foods.
The different geography and even climate of the North and South ended up making them differently susceptible to tobacco, rice, and other productions.
The soil on the North was not that suitable for farming. Many became ship builders, traders and fishermen. They'd import a lot of what was needed since farmers weren't many.
In the south on the other hand, as mentioned, rice, tobacco, and even indigo were constantly cultivated since the land seemed rich to do so, and the cheap labor was very needed.
They are both democracies. The United States is based off of ancient Rome. The United States however simplified lots of complicated things from the Roman government.
The main reason was joining the Axis Powers, which earned them territory.
