The Roman Empire was located in the Mediterranean, making the capital, Rome, a launch pad of sorts for all its expansionist ventures. Basically, Rome became wealthy by conquering its neighbors, taking back wealth to the capital where it was used accordingly to improve infrastructure, like roads, bridges, aquaducts and sewage systems. This infrastructure made travel easier around the empire, supporting the growth of trade and making conquest even easier. The booty that came back from sacking foreign lands also payed the soldiers' salary, and so the military became a means of earning wealth and status as one climbed the ranks. To continue to pay these soldiers, and to satisfy their ambitions for wealth and prestige that so came from war, Rome had to continue expanding, a lot. This contributed even more wealth to the empire (though later causing its collapse as over-expansion presented costly army maintenance fees and increased the length of the borders that needed to be defended, within and without). Beyond that, Rome's domination over the Mediterranean was good for trade and technological advances allowed for ships that could cross the Mediterranean sea, further stimulating trade. Controlling these trade routes also contributed to increased wealth that could be used for both internal growth and external expansion.
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Because the union had pushed them out of their land and hurt them so much, they wanted to seek revenge on the union. They had also hoped that the confederates wouldn't push them out any more.
Great Britain, France and Russia were the allied powers in World War One.
Russell founded the Watchtower Society, which later became the Jehovah's Witnesses.
