What were the major differences between the Roman Republic and the Roman Empire?

Indeed much of the key expansion of the Roman Empire occurred while it was still a Republic. Rome was an empire long before it was imperial. However, perhaps the key difference that the modern viewer sees between an imperial system and a republic is one of political participation and by extension legitimacy.

Explanation:

lincoln declared that slavery should not be allowed to spread into the new states, and of course this angered the south at the time.

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.