BlackPast.org has a great interactive African American History Timeline covering events from 1500-2021. Search this visual timeline to learn more, access related articles - that often feature primary source materials - use the filters to narrow your topic, or search by keyword. There is also a searchable table format of the timeline, allowing you to search by date, event, person, era, and more.
(click on image to enlarge)
(click on image to enlarge)