What is the main reason for the rise of "hoovervilles"
a.) many jobless americans could not afford to continue paying for their homes
b.) thousands of homes had been destroyed by the effects of the dust bowl.
c.) preparation for ww ii had created a shortage of building materials
d.) housing projects could not keep up with the demand for homes needed by the poor

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.

in the 1950s, country music came into its own before rock-n-roll took off in the 60s while jazz and classical music continued to innovate