Why does the fed pay interest to banks?

it is interest on money held in reserve.
it is interest on credit available to the fed.
it is interest on loans taken by the fed.
it is interest on government investments.

first, the romans stayed isolated because they had to defend their own territories from neighboring cities that were harassing them, like the etruscans. second, once the romans managed to defeat their neighbors, and started to expand their territory, they started to build roads and bridges. finally, now that the romans have covered their territory with roads functioning as highways, they could mobilize their legions faster to assemble larger military units in a specific place.

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