When world war i was beginning in europe, the united states was trading profitably with
a-the triple entente and the triple alliance.
b- the triple entente and the concert of europe.
c-the triple alliance and concert of europe.
d- the concert of europe and the central powers.

The correct option is A

Towards the middle of the 19th century, the United States managed to round off the territory from the narrow Atlantic strip to the peaceful façade, by conquering the immense territories of the Southwest. Before the formidable pressure, fomented by the federal government and turned into an epic that immortalized the Hollywood industry with the legendary Far-West, of farmers, planters, merchants, adventurers, European immigrants and missionaries, the mythical "Frontera", considered the territory Savage par excellence, it became a powerful factor in the expansion of capitalism. However, the conquest of the West served not only to increase agricultural, livestock and mining space (gold rush in California), and to promote the demographic development, but also to forge the myths from which the new nation has been nurtured until today. American All this helped the development of the US trade with the rest of the world and especially with all of Europe.

b. 155 enlisted men and no officers

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.