Many Civil War veterans and their widows or other dependents received pensions from the U. S. government for their support. For those researchers whose ancestors received pensions for service, these files are arguably the single richest record group in terms of information contained within them.
This column previously addressed the importance of the 1870 U. S. census in African-American research. As noted in that article, this was the first federal census after the end of the Civil War, and therefore the first record group to record personal information about former slaves nationwide. It was not, however, the earliest record group to do so in many localities. Many similar record groups were created that provide information about former slaves between 1865 and 1870.
The PBS program "American Experience" is a wonderful series of documentaries about the history of the United States. The series also has a remarkable online presence, often creating unique sites for each episode of the series.