Question

after germanys unification in 1871, industrialization accelerated and○ surpassed the us becoming first in steel production○ industrialization continued mainly in the west○ workers for industrial jobs were difficult to find.○ constructed vast networks of railroads.

Explanation:

After 1871 German unification, industrialization boomed with large railroad expansion as a key infrastructure driver. Germany did not surpass the US in steel production (US led later), industrialization spread beyond the west, and a large rural workforce supplied industrial jobs easily.

Answer:

constructed vast networks of railroads.