During the "dark ages", as named by historians, why did bridge engineering come to a halt?

the war powers resolution (also known as the war powers resolution of 1973 or the war powers act) (50 u.s.c. 1541–1548) is a federal law intended to check the president's power to commit the united states to an armed conflict without the consent of the u.s. congress.

explanation:

what are the options so i can answer it