Respuesta :

Answer:

the fertile soil

Explanation:

The fertile soil of the Po and Tiber River Valleys allowed Romans to grow a diverse selection of crops, such as olives and grains. This allowed the empire to have a food surplus to feed its population and trade with other societies. The empire also used the resulting wealth to expand its military strength.
It helped the romans understand the climactical conditions they were in, which helped them to find good soil that could sustain life and grow crops and vegetation which they needed to survive.

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