In atlantic slave trade, what areas of the world grew the fastest, in terms of economics, etc.?

North America, overall grew the most.

Through the Atlantic Slave Trade, many slaves and Europeans moved to the present-day US for many reasons. Europeans generally moved to have a new start of life or to strike it rich, while others were forced to go because of overcrowded prison systems. Africans were generally forced into bondage across the ocean, and would endure hardships not only out at sea but also in their new "homes". The Trade overall helped build up US market trading, and opened the US to European technology, products, as well as culture.

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c) they were beaten and fired from their jobs.

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.