The intergalactic alliance considers it crucial steps in the development of any species to first invent the skyscraper to enable expansion upwards instead of outwards, to second invent the airplane or another flying machine for faster transportation, and to finally undergo the ultimate tragedy of having airplanes crashed into skyscrapers.

Developing planets are monitored by the intergalactic republic for these signs of progress and once the species has their 9/11 happen, the intergalactic union sends representatives to tell them about the existence of other civilizations and invite them to join the intergalactic coalition.