How did the roman empire support its expansion and integrate culture on three continents

The construction of roads and bridges facilitated trade and communication.

Explanation:

Over time, Romans adapted Greek and Hellenistic achievements, just as the Greeks had once absorbed ideas from Egypt and the Fertile Crescent. The blending of Greek, Hellenistic, and Roman traditions produced what is known as Greco-Roman civilization. During the Pax Romana, trade and travel helped spread this vital new civilization.

the enslaved people onboard suffered from illness with some frequency

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.