This is the political idea the individual states have political powers related to the federal government. it was established in the 10th amendment.

The idea is that of state's rights.

The tenth amendment is very simple in its formulation: it states that the federal goverment only has those powers that the constitution explicitely says, while state goverments has all powers except those that the constitution explicitely forbids.

In other words, the federal goverment only has explicit powers, while the states have both explicit powers and explicit powers.

The tenth amendment was written with the aim of preventing the federal government from becoming too powerful, because the founding fathers lived in an era where republicanism and federalism were rare (the United States was essentialy the only major republic in the world by thtat time) while tyrannies and absolute monarchies abounded. They were afraid that giving more power to the federal goverment would result in a new tyranny.

fair labor standards act

explanation:

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.