Due to its increasing size and cheap means of production, it would be "Mexico" that is seeking to become the next world superpower, although there is still a great deal of political and economic corruption in the country.
Railroads helped connect the east and the west
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Susan B. Anthony, Harriet Tubman, Booker T. Washington, Thomas Edison, Woodrow Wilson, Franklin D. Roosevelt, Henry Ford, John Steinbeck, Rosa Parks, Billy Graham, Martin Luther King Jr., Malcom X, Barack Obama, etc.