Final answer:
The Gulf of Mexico is the point that, if controlled by the Union, would result in the Confederacy being unable to import or export goods.
Step-by-step explanation:
If controlled by the Union, the point that would result in the Confederacy being unable to import or export goods is the Gulf of Mexico. The Gulf of Mexico is a major body of water that connects to the Atlantic Ocean and provides access to trade routes. By controlling this point, the Union would effectively cut off the Confederacy from international trade and commerce.
Learn more about Trade routes