On September 26, 1983, there was a false alarm in the Serpukhov-15 bunker near Moscow which reported that four missiles were heading toward the USSR from America. In Real Life, the officer on duty was Colonel Stanislav Petrov, who realised that it didn't make any sense for the US to attack with only four missiles and logged it as a technical error, which it in fact was, rather than reporting it to his superiors. Because of his sound judgment, nuclear war was averted and countless lives saved.In the 1983: Doomsday timeline at the Alternate History Wikia, Colonel Petrov was sent to another installation before September 26th, 1983. The officer now on duty on September 26th considers the alert to be accurate and immediately contacts his superiors. Within minutes, the leaders decide to launch the whole Soviet nuclear arsenal. Logically, the Americans react by launching as well. By the time the first alerted missile is proven to be a false alarm, it's too late. Thousands of nuclear warheads subsequently detonate over targets worldwide. The People's Republic of China was attacked by Soviet nuclear missiles as well, and part of their arsenal is launched in response at the USSR.The results of this total nuclear exchange are close to the forecasts of almost complete worldwide destruction and the "nuclear holocaust" as predicted by many scientists of this time. This results in as many as two billion people killed initially, and another two billion in the subsequent environmental disaster.With the world largely devastated and most of the northern and parts of the southern hemisphere in ruins, the estimated 800 million survivors desperately try to keep together what is left of human society. Almost three decades later, the world is still only starting to recover.The scenario inspired a contributor to create a fanfiction collection called 1983: Doomsday Stories, which crosses over with Axis Powers Hetalia.
All Hail the Great God Mickey!: Played with. There are mentions of a faith worshiping Abraham Lincoln in the American survivor state of Lincoln, as well as a "Cult of the Once and Future King" (which worships the remnant British Monarchy as an extension of King Arthur) in New Britain.
The Alliance: Quite a few geopolitical blocs have emerged, including the Atlantic Defense Community, which is NATO's successor.
Allohistorical Allusion: A good deal present. Among others, there's a reference to a Western novel serving as a sequel to Mobile Suit Gundam. Which bears more than a passing resemblance to ∀ Gundam, though with some strange twists (eg. the Black History being both an allegory for Doomsday and an age-long plan by the Zabis).
There's also mention of the military/horror Shadow of Tomorrow novel, which is a continuation of H.P. Lovecraft's mythos...in French.
Alternate Self: The "honorary citizens" page has a few author stand-ins.
Apocalypse Anarchy: Played straight at least initially. Large parts of the world plunged into unrest and utter chaos, affecting even countries not directly affected by the bombs. Said chaos gradually faded out over time as order's restored and Survivor-Nations emerge, although this is still the norm in the wastelands.
Balkanize Me: Happened to pretty much every country that got nuked. For instance, the UK is currently broken up into the Celtic Alliance (Ireland, parts of Wales, Scotland, and western England, the Isle of Man, and Brittany), Ur Alba or New Scotland (south-west Scotland), the Kingdom of Cleveland (most of north-east England), Northumbria (the parts of north-east England that aren't Cleveland's, plus northern Cumbria), the Duchy of Lancaster (Lancashire, plus bits of North Yorkshire, Cumbria, Merseyside and Greater Manchester), the Wesmorland and Furness Territories (southern Cumbria. Is a protectorate of the Duchy of Lancaster), Newolland (South Kesteven, South Holland, parts of Cambrdgeshire and Norfolk), Woodbridge (part of Suffolk), Essex (Essex, Hertfordshire, East London, Luton), and Southern England (Isle of Wight and parts of Sussex), plus small city states.
Poland as well is mentioned to have split into two factions (one of them a remnant of the Communist government), both claiming to be the legitimate country.
Played with in Texas. There are seven successor states, but as they have slowly made contact with each other they have begun to integrate their institutions. Unification into a new Republic of Texas is an ongoing, messy process, but peaceful and approved by popular election in all seven states. They are not, however, too keen on joining the new USA, although they retain cordial relationships.
Also played around with former Germany. The West imploded, although various stable German Survivor-Nations had emerged from the ashes while what remained of Bavaria joined the Alpine Federation. Most of East Germany on the other hand is known as Prussia these days.
Big Apple Sauce: Averted with extreme prejudice; this city was hit by about two dozen warheads and decades later, scouts reported nothing but open water where Manhattan Island and Brooklyn were, and charred, radioactive wastelands covering the other boroughs and surrounding states.
Celebrity Survivor: A number of them survived either by sheer luck, ability or simply being far away from the worse-hit areas when Doomsday occurred.
Commie Land: How some view Socialist Siberia, including some of the former Soviet survivor nations. Especially considering that it's for all intents and purposes a reformed and slightly reworded USSR. Although it doesn't help that they did keep Pravda and the KGB are still running around. There are those in-verse who still view them as Dirty Communists due to the old Soviet connection of Doomsday.
Continuity Drift / Continuity Snarl: Owing to the wiki-style nature of the timeline as well as the various views of the moderators, a number of inconsistencies and debates tend to show up. Which makes maintaining at least some consistency all the more crucial.
Cozy Catastrophe: Subverted. Places like Australia, South America and the Alpine nations (Switzerland, Austria and Liechtenstein) managed to get by (almost) unscathed. But even they took a heavy beating from the initial aftermath. On the other hand, they also tend to become regional powers later on as the dust settles, with countries like the Alpine Confederation and ANZ Commonwealth being one of the most stable and powerful post-Doomsday areas.
Crapsack Only by Comparison: The Survivor-Nations in general, which really look like rough places to live in contrast to the leading pre-Doomsday countries. But compared to the wasteland they're usually surrounded by, they're still considered much better off.
Crapsack World: given the premise, but some parts of the world did recover. However, some lands, like the Netherlands, seemed to be doomed to being drowned and forgotten forever.
Some of the more devastated regions of the planet still evoke this trope.
Culture Chop Suey: Some parts of the world wind up experiencing this trope to some degree thanks to refugees, mass migrations and a variety of post-apocalyptic reasons. Mexico has an English-speaking minority and baseball teams, the ANZ Commonwealth has taken in a few American influences, Socialist Siberia is increasingly (and bilingually) Russian-Chinese and New Britain could be best described as an Afrikaner mirror of the old United Kingdom.
The Republic of Superior is described as fast becoming an institutionalized version of this trope, due to the rise of "post-nationalism" in its society.
Curb-Stomp Battle: The Ur Alba war, which broke out when the militaristic semi-fascist Scottish survivour nation the war's named after attempted to invade someone else's territory, involved four other nations ganging up on the Scots and ended just over two weeks later with the total defeat of Ur Alba, who suffered over twice the casulties of everyone else combined, and the total collapse of their government and military.
The Soviet invasion of Austria during Doomsday ended in a devastating failure as a joint Austrian and Swiss effort brutally push back the enemy before the end of 1983. A side-effect of this, however, was that the surviving Soviets degenerated into glorified warbands and proceeded to destroy what little remained of Hungary.
Deadline News: Several news networks such as CNN or NBC were broadcasting the 35th Emmy Awards when the outbreak of nuclear war began. Almost all of the newscasters and reporters giving the message were thought to have died soon after their final broadcast went out.
The (formerly Provisional) United States, formed from communities and remnants in the Midwest, at least tries to present a more benevolent version of the above. Although it's shown as increasingly working in conjunction with CRUSA.
The Federation: Crossed with The Alliance; The ANZ Commonwealth, Celtic Alliance, Nordic Union and Alpine Confederation are the most prominent ones, along with the South American Confederation. The North American Union tries to be this.
From Bad to Worse: For other parts of the world, like China, India, parts of North America and Eastern Europe, things are still going to hell. And in the case of countries such as Hungary, Belgium and the Netherlands, they were wiped clean off the map.
Future Imperfect: Averted, at least in the more civilized parts of the world. It's only been about 30 years since the bombs fell and a large amount of pre-Doomsday records were either preserved intact or recovered since then. That said however, certain details regarding what actually happened in Doomsday at certain regions of the world remain shrouded in obscurity while even in the more well-off parts, peculiarities like the "Cult of the Once and Future King" have sprung up.
Gargle Blaster: There is an article devoted to alcohol. One of the drinks mentioned is Poi-chin, the Cleveish form of poitin, aka Irish potato whiskey, which is about 60-80% ABV, has an unoffical age limit that is three years older than the legal drinking age, and can apparently get you drunk again the day after you drink it because even plain water will bring the remaing ethanol back into solution.
Grey and Gray Morality: The Saguenay War fought between Quebec sovereigntists and the surviving government in northeast Canada. Both sides believed they were fighting a defensive war (in Saguenay's case a preemptive one), both sides had good people fighting honorably for them, and both sides supported criminal elements.
Prussia's conflict with the Poles, or rather the ones under the remnant Communist government, over Pomerania can also count.
The Kingdom: Andorra, Luxembourg, Monaco and arguably Japan fit the bill, as do the British survivour nations Newolland, Cleveland and Northumbria. And it's also implied that a reunified France would also become this in the future, due to the Duke of Orleans being an influential figure (and having his own survivor nation near former Paris).
Liechtenstein serves this role as well within the Alpine Confederation, while Hawaii tries to be this as well.
In Spite of a Nail: Despite the significant changes brought about by Doomsday, some events mirroring those in Real Life still occur like the 2011 Earthquake in Japan. As well as the former Yugoslavia largely degenerating into a conflict zone-though the latter event happened earlier than OTL. And mass protests in the US successor states being referred to as an "American Spring," though it's implied to be instigated by both CRUSA and the (Formerly) Provisional USA.
League Of Nations: Revived and reformed after the destruction of the United Nations in Doomsday. Its main Headquarters is in Tonga, although there are other H Qs in Europe, Australia and South America. In practice though, it's shown to incorporate elements from both the old League and UN though its reach remains more limited than either.
Retro Universe: Despite being set in the present day much of the world doesn't look like it would fit in our 21st century. For example technology and culture have only advanced to early 90s levels at best. Many real world defunct nations are still around or have since been revived. Communism is still a major factor in world politics. In extreme cases some less fortunate survivor communities look more like they came out of the Middle Ages rather than the modern era.
Schizo Tech: Extremely common in surviour nations. For instance, a country can have a helicopter in its airforce, archers and swordsmen in its army, and depend on steam trains and literal horsepower for transportation.
Others, such as the Philippines, tend to replace the swordmen and archers with leftover weapons from World War 2.
East Texas (aka the Republic of Texas) had technology at the level of the 1800s, but made first contact with West Texas and Mexico via radio broadcasts.
Averted more or less among the larger and more established countries, although even they tend to fall into this trope to a lesser degree. While they may have roughly late-1980s to early-1990s technology, televisions, computers and telecommunications tend to be much less prevalent. Fuel issues also mean that there's a revival in train travel and even airships.
Scotireland: Ireland and Scotland merge after the collapse of the United Kingdom, forming the Celtic Alliance.
The Great Politics Mess-Up: Played with. Both the USA and Soviet Union splintered after Doomsday. While both nations have been reduced to rump states, the Soviet remnant, the Union of Sovereign Socialist Republics, has managed to hold on to more of its pre-Doomsday territory, and has even expanded into Mongolia, parts of China and even Alaska.
The USA is an interesting case in that unlike the USSR, it virtually collapsed entirely save for the American Exiles in Hawaii (later on moving to Australia) and Puerto Rico. On the other hand, a group of survivor communities in the Midwest forged a "Provisional United States" by the early 1990s, dropping the "Provisional" bit upon finding out that there really was no US Government anymore, the remnants having been integrated into Australian society.
The Mafia: They wield considerable power in Sicily post-Doomsday.
Vestigial Empire: Many of the nations worst affected on Doomsday still exist into the present, but are often mere remnants of their former selves. For example the People's Republic of China was only recently discovered to have a small fraction of its former territory and population, while France's overseas territories outside of Europe are all that remain of the former Republic.
New Britain literally sees itself as this, to the point that some (more often than not derisively) call it the Third British Empire. Coincidentally, the Celtic Alliance along with the Survivor Nations in Britain proper aren't too keen on their claims.
Vice City: Matlock, a former British spa and market town that became a haven for drugs growth, gambling, prostitution, and mercenary activity after Doomsday.
World Half Full: Most of the world's population got killed, either on Doomsday itself or in the aftermath, the Eighties were pretty much hell for most of the northern hemisphere, warlords, extremists and criminals took advantage of the situation to gain power and are still a problem to this day, large parts of the world are still uninhabitable radioactive wastelands, and several countries no longer exist. However, people still pulled through, the world is well on its way to being rebuilt (albeit with quite a few changes), there's still a lot of good people in the world, and things are slowly getting better.
Zeppelins from Another World: Justified in that airships use less fuel then heavier then air aircraft, an important consideration in a world where the supply of oil has been greatly reduced. The Prussia-based New Zeppelin Company is also mentioned as having become the leader in lighter-than-air transportation by 2011.