The Transport Union is a sovereign federation first proposed after the conclusion of the Interplanetary War. Through its mandate, territory has expanded beyond the Asteroid Belt and the outer Sol system and encompasses all that is not in the gravity wells of the planets themselves..
The Union establishes itself as a greater superpower than the former ones, the United Nations and the MCR, by controlling all inter-system and intra-system trade, as well as other economic and military aspects, such as assuring safety and fairness during interstellar transit throughout the Ring Network.
The trade system would re-stabilize Sol's economy and power balance, and also would improve international cooperation between the UN and the MCR.
The formation of the Transport Union was first discussed at a conference on the Medina Station, proposed by Holden. The idea was then formalized and accepted by Sol's heads of government. Thirty years after the bombardment of Earth, once the planet is recovered, the union itself has established stations outside the gravity wells and opens for business through a ceremony where president Drummer presides on TSL-5, transfer station at Lagrange-5.
Before this Union was established, the populations in the Belt had been brought together with the Outer Planets Alliance through a shared sense of struggle, oppression, and in many cases rebellion. With the change of conditions brought about because of the ring gates and the treaty which brought about union, the power base of the OPA dissolve and many constituents were absorbed in a new role within the Union. Deft members of the old OPA leadership parlayed their political capital for a position in the Union.