From the summary:
To commemorate and celebrate the contributions to our nation made by people of African descent, American historian Carter G. Woodson established Black History Week. The first celebration occurred on Feb. 12, 1926. For many years, the second week of February was set aside for this celebration to coincide with the birthdays of abolitionist/editor Frederick Douglass and Abraham Lincoln. In 1976, as part of the nation’s bicentennial, the week was expanded to a month. Since then, U.S. presidents have proclaimed February as National African-American History Month.
Note: The reference to the black population in this publication is to single-race black people (“black alone”) except in the first section on “Population.” In that section, the reference is to black alone or in combination with other races, a reference to respondents who said they were one race (black) or more than one race (black plus other races).