Human-San'Shyuum alliance

Human-San 'Shyuum Alliance
The Human-San 'Shyuum Alliance was an ancient alliance between the Human Empire and the San 'Shyuum. This alliance began as an economical one but soon turned into a military one when the Forerunners declared war on humanity and the San 'Shyuum

Trading and Economics
The origins of this alliance are unknown and all that is known is that the humans and San 'Shyuum would regularly trade technology, produce, and other things with each other. One of the things that the humans traded with the San 'Shyuum were the Pheru, which was a domesticated animal that humans and San 'Shyuum used as pets. The Human-Flood conflict only affected a few of the San 'Shyuum population because of the infected Pheru. However, during the Human-Forerunner War the San 'Shyuum, after seeing defeat was inevitable, broke the alliance and surrendered to the Forerunners.

Human-Forerunner War
During the Human Forerunner War the humans were generally in charge of military actions while the San 'Shyuum provided the provisions needed for a war. However after seeing the overwhelming force of the Forerunner Fleets the San 'Shyuum surrendered and made a peace treaty with the Forerunners, and thus they were not as severely punished as the humans. Instead of being deevolved, they were merely restricted to two planets. Also, to make sure that the humans and the San 'Shyuum never conspired together again, they were separated, and allowing the two species to ever meet again was forbidden.