one of the worst race riots in U.S. history
... that a year after the American Civil War ended, discharged soldiers had conflicts with local policemen in Memphis, which escalated into one of the worst race riots in U.S. history?
... that a year after the <a href="./American_Civil_War" id="mwBSU" rel="mw:WikiLink" title="American Civil War">American Civil War</a> ended, discharged soldiers had conflicts with local policemen in <a href="./Memphis,_Tennessee" id="mwBSY" rel="mw:WikiLink" title="Memphis, Tennessee">Memphis</a>, which escalated into <b id="mwBSc"><a class="mw-redirect" href="./Memphis_Riots_of_1866" id="mwBSg" rel="mw:WikiLink" title="Memphis Riots of 1866">one of the worst race riots in U.S. history</a></b>?