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.
