First of all according to the liberty background, the Texas incident was an experimental Long distance jumpgate. One that could send a ship across Sirius sector. During the test, it hit some darkmatter (bering/gallileo?) and the darkmatter came back through the gate, causing the massive explosion in texas. After that, the top secret testing program was moved into Alaska.
As for jumpdrives, I suspect that the original ones were rather slow and required a massive ship (aka, sleeper ships) This is something my Valhalla RP story is going to visit. The new work in faster, reliable jumpdrives, etc..
Iâll carry this flag
To the grave if I must
Because itâs flag that I love
And a flag that I trust