One of the most significant challenges is building an airplane had to do with "propulsion", since the technology that allowed motors to have enough energy to lift an airplane into the sky with a passenger wasn't available for most of history.
Answer:
hope it helps you
Explanation:
The soil and the mild climate helped the Romans grow surplus olives and grain. Reliable food production allowed the population to grow, and the trade in olives and olive oil helped the Roman economy expand.