Answer:
CAUSE: The decline of the buffalo is largely a nineteenth-century story. The size of the herds was affected by predation (by humans and wolves), disease, fires, climate, competition from horses, the market, and other factors. Fires often swept the grasslands, sometimes maiming and killing buffaloes. EFFECT: By 1900, Only a few wild Buffalo remained in Yellowstone, Montana—less than 500. At this point, Congress finally took action to outlaw the killing of birds and animals within Yellowstone National Park. The destruction of the Buffalo nearly destroyed the Native people as well