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A first-level civilization is also called a planetary civilization. If you achieve this civilization, you will have a place in the galaxy. For a single race with intelligent life, it is not difficult to climb the ladder of first-level civilization. It only takes millions of years of accumulation. The technology tree will eventually grow, and subsequent civilizations will also make a qualitative leap. If there are two intelligent life races on the planet, then the only way to reach the first level civilization is through unilateral racial liquidation. The race that wins the liquidation will have the right to speak and will inherit the methods of the first civilization to become a first level civilization. There are too many flukes in the origin of the first-level civilization, but without exception, they are all under the premise that racial liquidation occurred before the development of the technology tree. The technology tree is the cradle of civilization, and it is also sad... Kaya's race is located in the third-level civilization of the universe. His civilization has experienced the vast cosmic time, and the mother planet has also been annihilated by the gears of time. But the third-level civilization is a galaxy civilization... Kaya is a cleaner, and his daily task is to clean up some low-level civilizations. When he first started cleaning up, Kaya found that the development history of low-level civilizations was the same, and he was not merciful in cleaning up. Until he found a blue planet in the solar system. Their civilization was very weak and was about to reach the threshold of the first-level civilization. At the same time, they had many races, and the race headed by the human race had not liquidated other races...