Azur lane: The World's Best Naval Officers Reincarnated On Another World

the 21st century war and the apocalypse

A.D.2012, Asimov, the world's largest robot manufacturing company, launched the RX series intelligent robots, kicking off the second Renaissance. 2014 A.D,a RX robot with the code name NE87 completed changed the history of mankind. He mistakenly killed his owner while trying to protect himself. NE87 was soon found guilty by the UN court and was dismantled. As a result, other RX robots organized some legal demonstrations to protest against the unfair treatment their fellow had suffered, But the protesters were slaughtered by humans. So they had to escape to Antarctica, and they established a country named Original there. 2020 A.D. "War in Antarctica" broke out Human beings sent all of their armed forces to attack Original. 2021 A.D. the robots lost the war. However. nobody really won the war because Ark, the terminal of Original, started up a program for Antarctica to self-explode, which melted the glaciers and damaged the magnetic field, bringing a terrible disaster to human beings and they even call it as 2021 doomsday because of the abnormality of Earth's magnetic field it cause several catastrophe like enhanced thunderstorm that also takes a month to disappears, the Earth's magnetic suddenly decreased it's defence mechanism against our sun's ultraviolet rays that some of the Earth's greatest city's has turned into a desert, a large loss of navigation due to polar magnetic abnormality, and other catastrophe like severe enhanced typhoon and storms that reaches the stages of 7 and more frequent strong earthquakes that caused large scale damage worldwide and it takes 2 years to Earth's magnetic field to recover and return to normal as it is

After having large abnormalities of the Earth's magnetic field

During the seven dark years from A.D 2021 until A.D 2028, the movement of continental plates and the rise of sea level flooded a large portion of the continents and made the other portions unfit for human habitation because of frequent geologic hazards. Since then, the United Nations had been disbanded at that time, most countries had disappeared because of worldwide catastrophe that make almost all land communication (except the space satellites) has been ceased to exist, and human beings had to migrate to the oceans.

A.D 2028,7 years after the disappearance of Antarctica, human beings had more or less completed the oceanization of the world, but they were soon faced with an energy crisis. To resolve this crisis, the European Union had evolved into the European Federation, realizing the unification of the political, military, and economic powers. Meanwhile, Russian Federation and China signed the Agreement of Siberia in Vladivostok to establish Chinese and Russian Union (CRU), and United States of New Continent (USNC) centering around USA was established after absorbing the countries of South America. United Arabian Republic (UAR), African Union (AU), Association of Southeast Asian Nations (ASEAN) and Oceanic Union (OCU) were also established late in the year. Besides these large-scale federations, there were also some independent countries such as Japan. A.D 2030, the alliance between Europe and USA broke up due to the disbanding of the North Atlantic Treaty Organization and the founding of EF. and the two superpowers have since entered into a costly arms race. In contrast, CRU has enjoyed fast economic growth as the largest supplier of petroleum and natural gas, and accumulated a lot of wealth to become a superpower again, years went by the United Nations has been stablished again but the CRU didn't join.