It was intentional though. The bison didn't disappear because of western disease, they were hunted out to break up the natives ability to resist, so they could

It was intentional though. The bison didn't disappear because of western disease, they were hunted out to break up the natives ability to resist, so they could be killed and corralled, and the land be granted to settlers. Canada intentionally withheld food it owed to natives as part of treaty agreements, with the understanding that if a bunch of people starved to death, Canada wouldn't need to send as much food. Similarly, disease was spread intentionally through small pox blankets, with the intention listed