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.

answer; william penn's approach made the colony diverse by attracting many types of people and religions;