All the great nations and small countries realized that petty rivalries and enmity were a waste of time and life, and that a joint effort to ward off the Gas was in dire need. By the time the Domes were first built, the world was not just a bunch of separate countries at war but a United Alliance.
Information, designs, plans, discoveries, experiments, technology. Everything was free to be shared among every Colony of the Alliance.
And when the Awakening happened, the need to remain united was cemented in every person that lived within the Colonies. Every Colony was a friend of the next, and together, the Alliance built the great Walls that surrounded the Colonies. Of course, with the coaxing of scientists who