So, this has nothing to do with the plot of the last episode, just an observation. The Georgia Federation's border with Texas is the Mississippi River. If you look at the map it goes straight south instead of taking a hard right towards New Orleans. This is completely correct, the river wants to naturally flow the shortest distance possible to the gulf, we are currently artificially keeping it on it's current course. Without the Corps of Engineers, it would eventually reroute to the Atchafalaya River.
John McPhee's The Control of Nature
has a great section about this topic!