In 2X50 AD, humans successfully developed the first colony on the moon. Because the earth was already overcrowded and resources were becoming increasingly scarce, immigration to the moon became an issue that must be considered. Under the consultations of the governments of the United Nations, it agreed that the welfare and incentives for immigrating to the moon were given to them at 20% of the population proportion of each country. This was the case. There were originally more than 20 billion people on Earth, and about 4 billion people became new residents of the moon colonies.