Answer: Roman road system, outstanding transportation network of the ancient Mediterranean world, extending from Britain to the Tigris-Euphrates river system and from the Danube River to Spain and northern Africa. In all, the Romans built 50,000 miles (80,000 km) of hard-surfaced highway, primarily for military reasons.
Explanation:
Tobacco! Settlers in Jamestown realized that they could sell Tobacco to European countries to make lots of profit, since Tobacco was considered a luxury. Jamestown was able to survive due to all the commerce that was created around shipping Tobacco back to Europe.