The event that is a relative chronology above is that C. The Reconstruction era began after the Civil War ended.
When the relative date of an event is given:
By saying that the Reconstruction era started after the Civil War, the Reconstruction era is being relatively dated as the date is based the Civil War.
The other options are wrong because they all have a date attached which makes them absolute.
In conclusion, the relative date of the Reconstruction era is that it started after the Civil War.
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