Alien Blueprint: Salvation Factory from Scratch

The earth's resources are exhausted overnight, there is no food, no water, and there are not even any natural resources that can be used! But a huge one-way portal has appeared in the center of every country in the world! A projection of a national sports arena named Industrial Tycoon appeared over the capitals of various countries! Lin An's happiness factory system, which had never been activated, also began to slowly activate at this time! Lin An: "The output of iron plates is still too low and cannot meet the needs of the secondary product area at all... The ammunition reserves of the close-range anti-cannon are also not good, and they cannot meet the 24-hour continuous fire... Hey... I'm so anxious~~"