The admission of missouri as a slave state was controversial in the senate because a. the senate was proslavery. c. it would upset the balance. b. it would create sectionalism. d. the senate was antislavery.

c. it would upset the balance

Explanation:

The idea of the federation and the Union of the States was to eventually abolishing slavery, all of the efforts were to bring the pro-slavery states to an agreement unti abolishing slavery, and the forces between pro-against slavery states was fairly balanced, adding Missouri to the Union would mean that the senate approved the anexation of slavery states and miss-balancing the pro vs against slavery states.

answer; ///i believe the correct answer is john marshall;

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.