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African Americans (also referred to as Black Americans or Afro-Americans, and formerly as American Negroes) are citizens or residents of the United States who have at least partial ancestry from any of the native populations of Sub-Saharan Africa. Most African Americans are of West and Central African descent and are descendants of enslaved Africans within the boundaries of the present United States. However, some immigrants from African, Caribbean, Central American or South American nations, or their descendants, may be identified or self-identify with the term.

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The term African American carries important political overtones. Earlier terms used to identify Americans of African ancestry were conferred upon the group by colonists and Americans of European ancestry. The terms were included in the wording of various laws and legal decisions which some thought were being used as tools of white supremacy and oppression. There developed among blacks in America a growing desire for a term of self-identification of their own choosing.

With the political consciousness that emerged from the political and social ferment of the late 1960s and early 1970s, blacks no longer approved of the term Negro. They believed it had suggestions of a moderate, accommodationist, even "Uncle Tom" connotation. In this period, a growing number of blacks in the United States, particularly African American youth, celebrated their blackness and their historical and cultural ties with the African continent. The Black Power movement defiantly embraced Black as a group identifier. It was a term social leaders themselves had repudiated only two decades earlier, but they proclaimed, "Black is beautiful".

In this same period, a smaller number of people favored Afro-American, a common shortening (as is 'Anglo-American'). However, after the decline in popularity of the 'Afro' hairstyle in the late 1970s, the term fell out of use.[citation needed]

In the 1980s the term African American was advanced on the model of, for example, German-American or Irish-American to give descendents of American slaves and other American blacks who lived through the slavery-era a heritage and a cultural base. The term was popularized in black communities around the country via word of mouth and ultimately received mainstream use after Jesse Jackson publicly used the term in front of a national audience. Subsequently, major media outlets adopted its use.

Some such as Maulana Karenga and Owen Alik Shahadah argue African-American is more appropriate because it accurately articulates geography and historical origin. Thus linking a people to a continent as oppose to an abstract color. Others believe the term black is inaccurate because African Americans have a variety of skin tones.[citation needed] Surveys show that the majority of Black Americans have no preference for "African American" or "Black," although they have a slight preference for "Black" in personal settings and "African American" in more formal settings. Many African-Americans expressed a preference for the term, as it was formed in the same way as names for others of the many ethnic groups in the nation. Some argued further that, because of the historical circumstances surrounding the capture, enslavement and systematic attempts to de-Africanize blacks in the United States under chattel slavery, most African Americans are unable to trace their ancestry to a specific African nation; hence, the entire continent serves as a geographic marker.

For many, African American is more than a name expressive of cultural and historical roots. The term expresses pride in Africa and a sense of kinship and solidarity with others of the African diaspora—an embrace of pan-Africanism as earlier enunciated by prominent African thinkers such as Marcus Garvey, W. E. B. Du Bois and George Padmore.

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"The truth is that promoting science isn’t just about providing resources—it’s about protecting free and open inquiry,” President-elect Obama said. “It’s about ensuring that facts and evidence are never twisted or obscured by politics or ideology. It’s about listening to what our scientists have to say, even when it’s inconvenient—especially when it’s inconvenient. Because the highest purpose of science is the search for knowledge, truth and a greater understanding of the world around us.

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According to the Out-of-Africa model, developed by Chris Stringer and Peter Andrews, modern H. sapiens evolved in Africa 200,000 years ago. Homo sapiens began migrating from Africa between 70,000 – 50,000 years ago and eventually replaced existing hominid species in Europe and Asia. Out of Africa has gained support from research using female mitochondrial DNA (mtDNA) and the male Y chromosome. After analysing genealogy trees constructed using 133 types of mtDNA, researchers concluded that all were descended from a female African progenitor, dubbed Mitochondrial Eve. Out of Africa is also supported by the fact that mitochondrial genetic diversity is highest among African populations.

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