The capture of Port Hudson and the surrender at Vicksburg in 1863 were pivotal events in the Civil War that effectively divided the Confederacy. The correct response is:
The Confederacy could no longer get supplies from its western states.
With Vicksburg falling to Union forces on July 4, 1863, along with Port Hudson's capture shortly thereafter, the Union gained control over the Mississippi River. This effectively split the Confederacy in two, isolating the western states from the eastern states. Consequently, the Confederacy faced significant logistical challenges in transporting supplies and reinforcements across this divided territory.