What did the central plains indeans hunt?

Answer 1

The Native Americans or Amerindians [rather than "Indians"] of old famously hunted the huge AMERICAN BISON or AMERICAN PLAINS BISON (with the easy scientific name of Bison bison). The Native Americans hunted only as many bison as they actually needed for meat and for fur. In the 19th and early 20th centuries, American bison were hunted almost to extinction, not by the Amerindians, but by European settlers in North America. Fortunately, through conservation measures, the populations of the American bison have rebounded and it is not an endangered species any more.

In similar measure, the original human inhabitants of North America, the Native American tribes, were decimated close to extinction by the European settlers, and their populations never recovered.