This is an excerpt from an eighth-grade history textbook: Over 27 million people visited the 1893 Columbian

Exposition in Chicago, at a time when the total U. S.

population was only 65 million. People didn't just come

from all over the United States; they came from all over the

world to see what this young nation was about.

Which statement best represents the main idea of this source?

A. The 1893 Columbian Exposition was in Chicago.

B. Over 27 million people visited the Columbian Exposition.

C. The U. S. population in 1893 was 65 million.

D. The 1893 Columbian Exposition was very popular.

The correct answer is D) The 1893 Columbian Exposition was very popular.

The statement that best represents the main idea of this source is "The 1893 Columbian Exposition was very popular."

This is the correct answer because the excerpt tries to convey the idea that despite the United States was a young nation with a population of just 65 million people, the 1893 Columbian Exposition attracted 27 million people from all over the world, a fact that made the exhibition to be a very popular one.

This meant that although a young nation, the United States generated great expectations in different parts of the world to know its culture, customs, political and economic advances, and social organization.

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.

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