So 20 minutes into the future, year is 2039 there are two power blocks the United States of Euro Africa, and the Northern Condominium.
Thirteen Day War - Gineipaedia, the Legend of Galactic Heroes wiki
They get involved in a nuclear war that destroys almost all civilization. Because of the war only 1 billion humans survive, also regular religions seem to have died out since people saw there was no God coming to save them but humanity builds itself back together and unites into the United Earth Government capital is in Australia. The UEG was a democracy, at first they were improving humanity technology was advancing, humanity went into outer space and build colonies in other star systems so they made a police military the space force! But eventually democracy and civilization goes corrupt. Earth's resources were depleted so they taxed the colonies heavily. The colonies protested and the leader of the independence movement Sirius's capital was brutally oppressed by the space force. This led to a full scale war as the colonies rebelled and created the black fleet. Then the rebels beat back the earth's space force back to earth, and the brutal siege of terra began. There was no quarter soldiers fought till the death and did not surrender. Eventually the rebels won, and when they got to earth they bombed it from orbit, after all was said and done. Earth's population was reduced to 1 billion AGAIN. Though at least this time humanity was not only on earth. After this earth became a backwater and most people left.
United Earth Government - Gineipaedia, the Legend of Galactic Heroes wiki
Peace would not last the leaders of the black fleet would squabble amongst themselves one killed others and tried to become dictator but was assassinated. This led to a dark age that lasted 300 years. Eventually in 2801 another star system established the Galactic Federation and united humanity again it was a Republic and it was prosperous and things were great. They even created a new callender UC Universal Calendar since humanity was no longer bound to earth.
Calendar era - Gineipaedia, the Legend of Galactic Heroes wiki
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For a time, eventually society became corrupt, he rose to power and brought back societies values.Please be aware this video may contain inappropriate content for young views or those who recently ate lunch.
Rudolf Goldenbaum a young military officer became elected to lead the galactic federation and he was doing a good job, and changed it to an Empire with himself as the first emperor. He revitalized society, and favored German values. Very German values, when he put forward the Inferior Genes Exclusion Act which would euthanize anyone who was disabled or was considered to have defective genes people began to balk. So he abolished the Imperial Senate and made it a pure monarchy he also made his supporters those who were Germanic descended or could pass as German as the new nobility. He also started a new calendar again the Imperial calendar to establish the start of his dynasty was in 300 UC. This guy is basically space Hitler, and he won, no rebellion ousted him he ruled till he died of natural causes and he purged republican and those who objected to his Neo Action T4 plan. However even though he won eventually his successor "liberalized" they no longer enforced the inferior genes exclusion act, and the Galactic Empire eventually became a regular feudal monarchy like the Ancien Regime, where the nobility have their power because they are born into it, and the serfs just obey. The upside is that it's not soo Nazi like like when Rudolf ruled. The bad thing was that at least Rudolf was meritocratic if you were white and you could rise to be a noble if you were competent enough.
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But anyway eventually some Serfs led by Arle Heinneson. Broke off and used some asteroids made of dry ice to escape the Galactic Empire in the Long March of 10,000 light years they left the orion arm of the galaxy to the Sagitarius I think? They found a planet named it after Heineson and started a Democracy. Eventually the Galactic Empire found them and the two powers have been at war for the past few hundred years. The story starts off with two characters one on the Empire's side Reinhard Loehngram his sister was taken to be the Emperor's concubine he isn't happy about it, he wants to overthrow the Empire, become Emperor and reform it. On the Alliance side is Yang Wen Li. Supreme Genius too loyal to democracy for his own good. It shows both the good and bad sides of democracy, and autocracy. Legend of the Galactic Heroes. Highly recommend it.