Who had the biggest impact on Roman life? Support with evidence. (no fake)

Two groups who significantly influenced Roman culture were the Etruscans and the Greeks. The Influence of Etruscan Engineering​Romans learned a great deal about engineering from the Etruscans. Etruscan ideas included the arch and the cuniculus.

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loess contribute to the flooding of rivers by providing the silt that is washed into rivers and constantly raises the bed of the rivers. this elevation above the surrounding flood plains and dams allow the river to overwhelm the dams and flood thousand of square miles of neighboring flood plains.