What is the main idea of American dream?? Please help

The main idea of the American Dream is that in the United States each person, regardless of their origin, condition or characteristics, can achieve their goals and prosper economically and socially. This based on the main ideals of the nation, which are freedom and equality, which allow anyone who wants to start a life in search of happiness to achieve that goal more easily than in other parts of the world. Thus, through the American Dream is described the situation through which millions of immigrants who have come to this nation have passed, and have prospered economically, developed benefits for society and provided a better future for their families.

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in the 1800s, locomotives powered by steam made transportation faster and cheaper. the resulting rapid growth of railroads led to the connection of the atlantic and pacific railroad in oklahoma city in 1897.

in the last years of the century, the improvement of steam-based engines the expansion and growth of railroads. this growth increased when the companies started to build and expand, such as the atlantic and pacific railroad, which connected new mexico with california, and missouri with oklahoma. many of these new networks were built in oklahoma, and these changes transportation henceforward.