The answer will be 3. 4000 BC - 3001 BC
i only know 2. The Luftwaffe was basically the German Air Force and the Manhattan Project was a code name for the project to build the nuclear bomb during ww2.
Answer:
The Roman army made the roads and sea routes safe for traders. In turn, trade helped the economy grow. People in each area of the empire could sell what they grew or made to people in other areas who could use these goods. They could also buy things that they couldn�t produce for themselves.
Explanation:
