July 9, 2017 all-day
July 9, 1868. The 14th Amendment defined US citizenship and provided that no state shall have the right to abridge the rights of any citizen without due process and equal protection under the law.
Coming three years after the Civil War, the 14th Amendment also included provisions for barring individuals who assisted in any rebellion or insurrection against the US from holding public office, and releasing federal and state governments from any financial liability incurred in the assistance of rebellion or insurrection against the US.
Image: Greater Coat of Arms of the United States, Public Domain.