Writers of historical fiction often try to appeal to readers by blending historical facts with imaginary plots and characters :)
The main difference between the Roman Empire and the Byzantine Empire concerned the official religions they practiced. Whereas the Roman Empire was officially pagan up for most of its existence, the Byzantine Empire was Christian. The Byzantine Empire was the significant remnant of the Roman Empire that survived in southeastern Europe for a thousand years after the official fall of Rome in 476 CE. As noted, a key difference with Rome was that the Byzantine Empire was always Christian rather than pagan. This hardwired into Byzantium a lack of cultural openness to the kind of religious diversity that had helped classical Rome to expand and thrive.
Another important difference was the relative weakness of Byzantium vis-à-vis the Roman Republic's power in its heyday. While powerful in some ways, Byzantium did not function as a hegemonic cultural, political, and military superpower in the same way as did the classical Roman Empire. This had the downside of leaving western Europe vulnerable to attacks, particularly from Viking marauders, that would not have occurred under the Roman Empire, but this also created an upside in which the western Europeans were forced to create their own vibrant and flexible cultural, political, and military institutions and infrastructures in order to survive.
Byzantium remained crucially important, however, because it controlled Constantinople, the gateway to the Mediterranean as well the gateway to overland passages to Asia. This was a source of access to vital trade routes with the East that this remnant of the Roman empire safeguarded for western Europe. Unfortunately, however, unlike Rome in its heyday, Byzantium ultimately lacked military might to keep this territory from Muslim conquest.
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The Zimmermann Telegram ›
On April 2, President Wilson asked Congress to declare war against Germany specifically citing Germany's renewed submarine policy as “a war against mankind. It is a war against all nations.” He also spoke about German spying inside the U.S. and the treachery of the Zimmermann Telegram.
The Maya were native people of Mexico and Central America, while Aztec covered most of northern Mesoamerica between c.1345 and 1521 CE, whereas Inca flourished in ancient Peru between c.1400 and 1533 CE and extended across western South America.
The effects of manufacturing and capital on the U.S. economy were profoundly intense. As soon as the Industrial Revolution spread to the US from Britain, US GDP rose dramatically and millions more people were put to work in factories--lifting the middle class.