 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 than multiculturalism as defined above, which does not include complete assimilation and integration. An Americanized (and often stereotypical) version of the original nation's cuisine, and its holidays, survived. 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 nineteenth century in Europe and the United States, then as political and cultural pluralism at the turn of the twentieth. 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 46.3 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.
Multiculturalism is seen by its supporters as a fairer system that allows people to truly express who they are within a society, that is more tolerant and that adapts better to social issues. They argue that culture is not one definable thing based on one race or religion, but rather the result of multiple factors that change as the world changes.
Historically, support for modern multiculturalism stems from the changes in Western societies after World War II, in what Susanne Wessendorf calls the "human rights revolution", in which the horrors of institutionalized racism and ethnic cleansing became almost impossible to ignore in the wake of the Holocaust; with the collapse of the European colonial system, as colonized nations in Africa and Asia successfully fought for their independence and pointed out the discriminatory underpinnings of the colonial system; and, in the United States in particular, with the rise of the Civ