Respuesta :
Answer:
As the expedition pushed up the Missouri through Nebraska and into present-day South Dakota, the herds grew in number. In early September, Clark noted a herd which numbered about 500; a couple of weeks later, Lewis observed a herd which he estimated at 3000.
Should Help: Most of the land Lewis and Clark surveyed was already occupied by Native Americans. In fact, the Corps encountered around 50 Native American tribes including the Shoshone, the Mandan, the Minitari, the Blackfeet, the Chinook and the Sioux