When pioneers settled the Midwest and Plains states,they killed or drove off the American bison,cougar,wolf,etc.Why does the elimination of such natural predators cause ecological problems?

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The Answer of When pioneers settled the Midwest and Plains states,they killed or drove off the American bison,cougar,wolf,etc.Why does the elimination of such natural predators cause ecological problems?

When Pioneers Settled the Midwest and Plains States,they Killed or Drove