How did innovations in engineering most contribute to the lasting survival of the Roman Empire?

They helped the empire create alliances.
They helped the empire spread its culture.
They helped the empire expand its territory.
They helped the empire build a stronger military.

i need answer choices

answer; people where able to travel across the u.s.a faster than any other mode of transportation,travel time was about a week,from coast to coast

the best description of postwar writers might be progressive.

following the war, writers showed a tendency to work on artistic or social matters rather than political themes. while postwar literature may not have been the greatest period of english literature, the themes provided excellent critics a high number of novels. such examples include anthony burgess, anthony powell and frank kermode, all of which can be placed under the progressive view.

the real answer is b