Latino Americans, Hispanic Americans, and African Americans are the three main cultures that laid the foundation for the United States.
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Explanation:
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According to the research data available Hispanic and Latino Americans are the most ethnic population consist of an estimated 17.8% of the US population. They are considered to be the early settlers of the USA and their culture is well established throughout America.
Then came the African Americans are the major racial minority, consist of over 12.7% of the USA population. African-American culture had been developed so many year separately from European-American culture, because of presence of racial discrimination and the slavery in America, besides this African-American slave descendants' has the aspiration to create and preserve their own traditions.
It could be argued that it is "the media" that is the most important social institution in American life, since having a free press is one of the most important elements of a democracy.
The muckrakers provided a service to the American public by exposing abuses in government and industry. This took place during the Progressive movement.