1870The 15th Amendment to the U.S. Constitution was passed, prohibiting federal and state governments from denying a citizen the right to vote based on “race, color or previous condition of servitude.” It was ratified on Feb. 3, 1870, as the third and last of the Reconstruction Era amendments. 1870Texas became the last Confederate state to be readmitted to the union. Over the years, the United States’ sovereignty over Texas has been disputed, revolving around the legitimacy of its readmittance as …