Bison died because people killed them for their good uses
They needed the bison for food.
The Bison started to die off because of the white settlers came. They were at war with the Indians so the started killing the bison. Some even killed the bison for game!
By getting killed by the setlers
Prior to the arrival of Europeans, there were millions of bison. The Native American population was not excessive. They only killed what they needed for food, and the animals they killed were replaced by bison calves each year, so the hunters did not deplete the bison population.
biological warfare -smallpox killed the bison herds to almost extinction shot them
Bison roamed the prairies and were hunted by the plain Indians but they only killed a few so they would have enough bison to hunt.But when the white men came they started to hunt the bison to extinction but that didn't happen.
Native Americans were hurt because they ate bison as a part of their diet so they lost some food.
The buffalo (bison) became endangered of extinction in the 19th and early 20th centuries because they were shot for sport in great numbers by passengers on trains crossing the prairies where the bison live.
There are two species of Bison in the genus Bison. The American Bison is Bison bison and the European Bison is Bison bonasus.
Buffalo Bill was not killed by an American buffalo (bison). He died of natual causes (kidney failure) on January 10, 1917.
Settles came and farms were made. New plants and animals were brought in. Most of the bison were killed. Some animals moved to other areas.