Leaving the discussion of the trigger for later, lets say a debate in Congress gets overheated and gets violent between Senators, leading to secession or something like that, lets say the states of Florida, Georgia, and South Carolina secede and form a Confederacy of Southron or something of that like. What happens? The Mexican American War has not begun yet, so Texas is still terrified of Mexico and in a flux.
Would Texas align with Britain to stay alive?
Would the CS be attacked, assuming they fire no first shot?
Would more states leave the Union to follow, or not?
How will this affect Texas and the American West?