Old is New Again!
At the height of human space travel, a small particle made it possible to construct stable wormholes called the Luz-Phosphorous conduits.
As time went ECS officials laid heaver taxes and the FES planets began to see the CES officials as greedy and overreaching.
Outlying systems began to resent the ECS and sent a petition to succeed, causing even more interruptions in travel and shipment of goods.
All wars start small. The end result of this one is still felt today…