The result of a Paradox Megacampaign, starting in 867 wyth Byzantium, and ending in 1936 with the Roman Republic (a bit ASBish on the edges: it's Paradox):
And the (still WIP) Alliances map:
The year is 1936 according to the Christian Calendar (many Romans will tell you it's actually 2689 after the Foundation of Rome, but meh). The world is ongoing a rising Cold War between two major blocks: the Alliance of Progress and the Pact of Cuzco.
The Alliance, covering most of Europe and Africa, as well as large parts of the Americas and Asia is led by the Fourth Roman Republic, a heir of the New Roman Imprium, formed in 1076 AD by the Byzantine Emperor Heralkeios Rhomaniôn. During most of its istory, the Imperium expanded on all the continents, often clashing with its neighbors. Rome is also one of the countries that was hit the hardest by the Grim Years, between 1890 and 1920 AD, in which the Roman nation saw more than 10 Revolutions, two *Communist directorates, one *Fascist Dictatorship, One *Anarchist Commune and three democratic regimes (the regime is currently the Fourth Republic, because to the three modern regimes is added the antique Roman Republic). Now, for the first time in history, the Roman Republic is led by Socialists, as it enters a new age.
Its main allies are: The *Ottoman Empire, an industrial powerhouse in the Asian Steppes, and a constitutional Monarchy, although a bit fascistic at times, carved out of the lands of the Golden Horde in the 1500's, the Indian Republic, once the greatest rival of Rome and now a steady ally, under Ottoman influence, as well as a colonial power of fair size, and the Abyssinian Republic, spanning from the Nubian desert of Sudan to the Cape of World's End (Good Hope OTL). A rich and developed country, it has nontheless suffered a messy civil war during the Grim Years, in which it endured no less than 20 revolutions. Other important Roman allies include: the Malian Deomcratic Republic, only major communist state in the world, the Kingdom of Rajastan, a consititional Hinduist monarchy, and the Korean Compact, a nasty dictatorship, but having coomon interests with the AOP.
Meanwhile, the Pact of Cuzco, an alliance roughly as pwoerful as the AOP, is led by the three most militarized countries in the world: The Incan Republic, in Emergency State since the Coup D'Etat of 1915, in which the Incan Democracy was overthrown, still bitter about the wars fought with Rome for the control of Brazil, and on increasingly bad terms with its allies-rivals: its northern nighbour, the Aztec Imperium, is still mad about the loss of Yucatan more than two centuries ago, but hates more the Romans, who took control of formerly Aztec Midwest, which the nasty fascistic regime of Tenochtitlan still claims to this day. Finally, the third major member of the POC is the Russian Oligarchy, a society in which voting rights are only grnated to landlords, and where the Liberals (OTL European sense of the term) are continually re-elected. the oldest rival of Rome, it also holds a standing rivalry with Sweden, one of the two neutral major powers, for the loss of Arkhangelsk during the Great War of 1880-1891.
Two major powers are still neutral in this cold war: the prosperous Swedish Republic, although Roman-Leaning, keeps a steady neutrality along with their Scandinavian allies: the Icelandic Republic, which made up for its size by colonizing parts of Africa and America, and the Vinlandic Republic, a former Icelandic colony on very good terms with the Motherland. Finally, the Kingdom of Australia is the only major power which neither fought in the Great War, nor was hit by the Grim Years, but instead enlagred their economy and industry while international trade collapsed at the turn of the XXth century.
Another interesting states needs a note: the Bengali Raj. Once dominating large parts of Asia, it was defeated by the Indian Empire during the War of the Ganges in 1769, and consequently suffered increasing separatism. To this day, Bengali is still the second most spoken language in Asia after Chinese, and the absolute ruler of Bengal, the Great Raja, still claims most of Asia as his rightful territory.