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United States

Although official multiculturalism policy is not established at the federal level, ethnic and cultural diversity is common in rural, suburban and urban areas.

Continuous mass immigration was a feature of the United States economy and society since the first half of the 19th century. The absorption of the stream of immigrants became, in itself, a prominent feature of America's national myth. The idea of the melting pot is a metaphor that implies that all the immigrant cultures are mixed and amalgamated without state intervention. The melting pot theory implied that each individual immigrant, and each group of immigrants, assimilated into American society at their own pace. This is different from multiculturalism as it is defined above, which does not include complete assimilation and integration. The melting pot tradition co-exists with a belief in national unity, dating from the American founding fathers:

Providence has been pleased to give this one connected country to one united people – a people descended from the same ancestors, speaking the same language, professing the same religion, attached to the same principles of government, very similar in their manners and customs... This country and this people seem to have been made for each other, and it appears as if it was the design of Providence, that an inheritance so proper and convenient for a band of brethren, united to each other by the strongest ties, should never be split into a number of unsocial, jealous, and alien sovereignties.

As a philosophy, multiculturalism began as part of the pragmatism movement at the end of the 19th century in Europe and the United States, then as political and cultural pluralism at the turn of the 20th century. It was partly in response to a new wave of European imperialism in sub-Saharan Africa and the massive immigration of Southern and Eastern Europeans to the United States and Latin America. Philosophers, psychologists and historians and early sociologists such as Charles Sanders Peirce, William James, George Santayana, Horace Kallen, John Dewey, W. E. B. Du Bois and Alain Locke developed concepts of cultural pluralism, from which emerged what we understand today as multiculturalism. In Pluralistic Universe (1909), William James espoused the idea of a " plural society ". James saw pluralism as "crucial to the formation of philosophical and social humanism to help build a better, more egalitarian society.

The educational approach to multiculturalism has since spread to the grade school system, as school systems try to rework their curricula to introduce students to diversity earlier – often on the grounds that it is important for minority students to see themselves represented in the classroom. Studies estimated 46 million Americans ages 14 to 24 to be the most diverse generation in American society. In 2009 and 2010, controversy erupted in Texas as the state's curriculum committee made several changes to the state's requirements, often at the expense of minorities. They chose to juxtapose Abraham Lincoln's inaugural address with that of Confederate president Jefferson Davis; they debated removing Supreme Court Justice Thurgood Marshall and labor-leader Cesar Chavez and rejected calls to include more Hispanic figures, in spite of the high Hispanic population in the state.

According to a 2000 analysis of domestic terrorism in the United States, "A distinctive feature of American terrorism is the ideological diversity of perpetrators. White racists are responsible for over a third of the deaths, and black militants have claimed almost as many. Almost all of the remaining deaths are attributable to Puerto Rican nationalists, Islamic extremists, revolutionary leftists and emigre groups." Twenty years later, far-right and white racists were observed as the leading perpetrators of domestic terrorism in the U.S. According to a 2020 study by the Strategic & International Studies, right-wing extremists are responsible for the murder of 329 people since 1994 (over half due to the terrorist bombing of the 1995 bombing of the Alfred P. Murrah building in Oklahoma City, which killed 168 people).