Hostages were held by iran during the presidency of: bill clinton jimmy carter ronald reagan

Hostages were held in Iran during the presidency of Jimmy Carter.

Explanation:

The Iran Hostage Crisis took place over a period of 444 days, during which a group of Iranian students took 66 diplomats and citizens of the United States of America as hostages. The crisis began on November 4, 1979 and lasted until January 20, 1981, during Jimmy Carter's presidency.

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.

b. the 200th birthday of the united states