In 2126 AD, under the severe crisis of scarcity of resources and energy scarcity, the earth eventually formed four strong alliances: the American Union, the European Union, the Chinese Union, and the Japanese-Africa Alliance.

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In 2134 AD, the manned spacecraft of the American Union successfully reached Mars and announced that Mars was the American Mars. In the same year, the EU and China League arrived one after another. In the third year, the Japanese League did not know where to steal the technology, so they also snatched it. The announcement of the US Alliance was ignored. After a long period of consultation and confrontation, the four major alliances reached an agreement to jointly develop Mars.

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In 2349 AD, all planets and satellites in the solar system and meteorites with a diameter of more than 1,000 kilometers were all allocated in the four major alliances. All countries on Earth had to choose one camp to join. From then on, there were only four alliances left on Earth.

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In 2357 AD, the China Alliance took the lead in developing a real spacecraft and officially walked out of the solar system. However, it was discovered that the nearest stars had to be calculated in light years. With existing technology, it was completely impossible to reach. In the four alliances in the solar system, the contradictions became sharper again. The alliance system of the four alliances was not suitable for the needs of the situation, so it was transformed into a more cohesive national institution. The United States of America, the United Nations of Europe, the Republic of Japan and Africa.

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In 2489 AD, a war initiated by Japan and Africa broke out. The United States and Japan and Africa united front, and the European and Chinese camps began a century-long battle for solar system resources.

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In 2601 AD, aliens visited the solar system, claiming that the Earth's civilization had reached the minimum standard for joining interstellar civilization, and some free technology was opened to allow interstellar colonization.

In 2646 AD, the United States found habitable planets and began population migration. In 2671 AD, China also found the planet and began to migrate, and abandoned the AD system. Taking this year as the first year, the Chinese system was established; in 2674 AD, the European country; in 2689 AD, Japan and Africa.

Because of obtaining alien technology, the four countries entered a period of rapid development and began to connect with alien civilizations. However, the four countries on Earth were only the primary civilization and could not obtain further technology. High technology is no longer free, making the four countries' activities still limited to a range centered on the solar system and a radius of ten light years.

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In the 316th year of the Chinese calendar, a more tragic war for resources broke out, and the war zone still occurred in the solar system, lasting for more than a hundred years, known in history as the Second Four-Nation War.

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In the 439th year of the Chinese calendar, all four countries paid a heavy price. With the mediation of alien countries, the four countries war finally stopped.

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Chapter completed!