Which of the following was a major accomplishment of romans in the field of transportation and them to maintain their vast empire?

I believe that The Romans are known for their remarkable engineering feats,  Their constructions, many of them still standing, are a testament to their superior engineering skills and  improving the daily lives of Romans and helping Rome maintain its  trade, and to maintain control over the Empire's vast territories.

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countries such as spain, france and portugal colonized the region. although most of latin america was colonized by spain, the countries of portugal and france also had major influences on the region. due to war and disease, native populations were decimated.

haile selassie i was the emperor of ethiopia from 1930-1974