What was Germany's greatest problem at the beginning of the war?

A. It had begun a two-front war with Russia and France.

B. A Communist revolution threatened to overthrow the Kaiser.

C. The United States had entered the war on the side of the Allies.

D. The British navy had blockaded its ports and began sinking its ships at sea.

union blockade

explanation:

the union blockade in the american civil war was a naval strategy by the united states to prevent the confederacy from trading.

the blockade was proclaimed by president abraham lincoln in april 1861, and required the monitoring of 3,500 miles (5,600 km) of atlantic and gulf coastline, including 12 major ports, notably new orleans and mobile. those blockade runners fast enough to evade the union navy could only carry a small fraction of the supplies needed. they were operated largely by british citizens, making use of neutral ports such as havana, nassau and bermuda. the union commissioned around 500 ships, which destroyed or captured about 1,500 blockade runners over the course of the war.