In June of 1947, a mysterious radio transition was made to Earth in a language that noone could understand. While some discarded the message, the United Nations deciphered the language as a distress signal from several alien vessels requesting asylum on Earth.
On July 8th, 1947, five large vessels parked themselves in orbit above the Earth. An emergency session of the United Nations led to the Votan Resettlement Solution, in which members of the UN would take in half a million aliens from the five species on the ships. Since then, the seven races of the Votan have lived among the humans of Earth.