Which song descended from "I'll Overcome Some Day" and used "O Sanctissima "?
O Sanctissima:  The tune has been notably reused for the German Christmas carol "O du fröhliche" (O, how joyful), the English recessional hymn "Lord, Dismiss Us With Thy Blessing", and the first half of the American civil rights anthem "We Shall Overcome". We Shall Overcome:  The song is most commonly attributed as having descended lyrically from "I'll Overcome Some Day", a hymn by Charles Albert Tindley that was first published in 1900.
We Shall Overcome