after germany’s unification in 1871, industrialization accelerated and1 surpassed the us becoming first in steel production.2 industrialization continued mainly in the west.3 workers for industrial jobs were difficult to find.4 constructed vast networks of railroads.

The correct answer is alternative 4 (D): "Constructed vast networks of railroads."

After its unification, German Industry grew strong, but it didn't surpass the US in steel production, and industrialization continued all over the land. Besides, it wasn't hard to find workers for industrial jobs.

The construction of railroads is both a result of and a factor in the industrial growth of Germany.

“the battle of stalingrad is not a turning point necessarily in strategic terms, because a lot more has to be done before the soviets can be certain of defeating germany,” says renowned world war ii historian richard overy. the germans had fought nearly a thousand miles across the soviet union to get to stalingrad.

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.