African Americans, also referred to as Black Americans or Afro-Americans, are citizens of the United States who have total or partial antebellum ancestry from any of the native populations of Sub-Saharan Africa. Specifically, most African Americans are of West and Central African descent and are descendants of enslaved peoples within the boundaries of the present-day U.S. 
Juneteenth, also known as Freedom Day or Emancipation Day, is an American holiday. It commemorates the announcement of the abolition of slavery in the U.S. State of Texas in 1865. Celebrated on June 19, the term is a portmanteau of June and nineteenth, and is recognized as a state holiday in 36 states of the United States.
We deem it a settled point that the destiny of the colored man is bound up with that of the white people of this country. ... We are here, and here we are likely to be. To imagine that we shall ever be eradicated is absurd and ridiculous. We can be remodified, changed, assimilated, but never extinguished. We repeat, therefore, that we are here; and that this is our country; and the question for the philosophers and statesmen of the land ought to be, What principles should dictate the policy of the action toward us? We shall neither die out, nor be driven out; but shall go with this people, either as a testimony against them, or as an evidence in their favor throughout their generations.
—Frederick Douglass (c.1818–1895),
Essay in North Star (Nov. 1858); as quoted in Faces at the Bottom of the Well: The Permanence of Racism (1992) by Derrick Bell, p. 40.
... that Shirley Chisholm was the first African American candidate for president of the United States for a major political party when she campaigned during the 1972 election?
... that in 1872, Western University in Kansas, USA, selected Charles Henry Langston, abolitionist, politician and future grandfather of poet Langston Hughes, as principal of its new normal school?
... that the Charles Sumner School served as the first teachers college for African-Americans