Year 1870 (MDCCCLXX) was a common year starting on Saturday (link will display the full calendar) of the Gregorian calendar and a common year starting on Thursday of the 12-day slower Julian calendar.

Joseph Joachim Raff (May 27, 1822 – June 24 or June 25, 1882) was a German-Swiss composer, teacher and pianist.

Raff was born in Lachen in Switzerland. His father, a teacher, had fled there from Württemberg in 1810 to escape forced recruitment into the military of that southwestern German state that had to fight for Napoleon in Russia. Joachim was largely self-taught in music, studying the subject while working as a schoolmaster in Schmerikon, Schwyz and Rapperswil. He sent some of his piano compositions to Felix Mendelssohn who recommended them to Breitkopf & Härtel for publication. They were published in 1844 and received a favourable review in Robert Schumann's journal, the Neue Zeitschrift für Musik, which prompted Raff to go to Zürich and take up composition full time.

In 1845, Raff walked to Basel to hear Franz Liszt play the piano. After a period in Stuttgart where he became friends with the conductor Hans von Bülow, he worked as Liszt's assistant at Weimar from 1850 to 1853. During this time he helped Liszt in the orchestration of several of his works, claiming to have had a major part in orchestrating the symphonic poem Tasso. In 1851, Raff's opera König Alfred was staged in Weimar, and five years later he moved to Wiesbaden where he largely devoted himself to composition. From 1878 he was the first Director of, and a teacher at, the Hoch Conservatory in Frankfurt. There he employed Clara Schumann and a number of other eminent musicians as teachers, and established a class specifically for female composers (this was at a time when women composers were not taken very seriously). His pupils there included Edward MacDowell and Alexander Ritter.

African Americans (also referred to as Black Americans or Afro-Americans, and formerly as American Negroes) are citizens or residents of the United States that have ancestry from any of the native populations of Sub-Saharan Africa.

African Americans make up the single largest racial minority in the United States. 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.

African-American history starts in the 16th century with African slaves who quickly rose up against the Spanish explorer Lucas Vázquez de Ayllón and progresses to the present day, with Barack Obama as the 44th and current President of the United States. Between those landmarks there have been events and issues, both resolved and ongoing, including slavery, racism, Reconstruction, development of the African-American community, participation in the great military conflicts of the United States, racial segregation, and the Civil Rights Movement.