A highly detailed black history timeline can be found at the BlackPast website. This site takes users through the early 15th century enslavement of Africans, the Emancipation Proclamation of 1863 (as well as the events leading up to it), and the cultural and political accomplishments of African-Americans during the 20th and 21st centuries.
The timeline also extends back to the speculated 8th or 9th century voyages of African explorers to the Americas. This theory is based on Olmec stone carvings of people with African physical attributes.
This early discovery of the Americas would have preceded Christopher Columbus' 1492 expedition, originally thought to be the first, in which a black man played only a secondary navigational, albeit free, role.