What was one important achievement of the roman empire

The ancient Romans build several engineering marvels including magnificent aqueducts, durable roads and splendid structures like the Colosseum and the Pantheon. Apart from engineering they made important contributions to architecture, law, literature, science and technology owing to discoveries and innovations.

Explanation:

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according to the passage the most suitable options are two. the first one is "by leading the aef to victory in several key battles" like the battle of saint- mihiel and the battle of cantigny mentioned in the passage you copied here. the second one is "by the aef and allied forces defeat germany" since the passage says that his army destroy the german resistance in the meuse- argonne offensive. and also, "by insisting that the aef operate as an independent force".

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