What happened to the Roman Empire’s territory as time passed?

(See explanation below for further details)

Explanation:

The Roman Empires keeps expanding from 1st to 2nd Centuries by the annexation of part of the British Islands, territories of the actual Romania and parts of Mesopotamia. Then, expansions ceased and after the 3rd Century Crisis, barbarians invaded the Roman Empire and they received parts of land in the western part of the empire in exchange of their help to combat another barbarians. In 395, the Roman Empire was definitely divided into two territories and by 470, the Western Roman Empire was limited to the territories in the Italian peninsula.

the underground railroad (apocope of the metropolitan railroad) is a system of urban trains located within a city and its metropolitan area. it is characterized for being a massive transport of passengers in the big cities, uniting diverse zones and their environs, with high capacity and frequency and in segregated form to other systems of transport. metropolitan railroads are built underground or on the surface, although most systems use mixed models where sections are combined in both modalities.

1 - as a result, the metro tends to reduce car travel for two reasons: first, due to the greater transfer of users from the car and, second, due to the reduction in the acquisition of cars in homes located in sectors near the stations of the metro.

2 -the metro allows to contribute effectively to the achievement of all the objectives of an urban development policy: it improves the efficiency of the city's economy by reducing travel costs and also generates a higher level of activities in the city center, taking advantage of of the agglomeration economies.

3 -it is a clean means of transport, since it uses renewable energy (usually electricity), taking care of the environment and avoiding excessive pollution.

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