Why did southern whites feel threatened by the missouri compromise?

The Missouri Compromise was passed into a law in 1820 and was important an important law as it led  to the American Civil War. It was formulated by Henry Clay, a senator from Kentucky and was passed into law by James Monroe in 1920. The law caused extreme tension between pro slavery and anti-slaver states as there were equal number of pro and anti slavery states. But when Missouri requested to become slave states it caused tension as it could have tip the balance towards slave states. Although Missouri compromise added Missouri as a slave state, simultaneously it added Maine as a free state. The compromise banned slavery in the Great Northern Plains of Louisiana Territory, this line came to be known s Missouri compromise line. This compromise ended with Kansas-Nebraska Act in 1854.  The southern states felt threatened with the compromise because they considered that the compromise was meant to end the slavery in southern states.

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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