The Ori Crusade was a holy war that the human followers of the Ori waged against the races of the Milky Way in an attempt to convert the galaxy to Origin. It was instrumental in breaking apart the last vestiges of the System Lords, allowing the younger races to rise up and take their places as the new superpowers, though they would suffer incredible losses in the process. The conflict drove a noticeable wedge between the three major powers that had defeated the Goa'uld, but by its end, the Tau'ri, Free Jaffa, and Tok'ra were united once more.