What mistake did Louis and Clark make in the description of the great plains?

Lewis and Clark mistakenly described the Great Plains as a barren, inhospitable region lacking in resources and potential for agriculture. They perceived the area primarily as a vast, empty expanse, underestimating its ecological diversity and the resilience of Indigenous peoples who thrived there. This limited perspective influenced subsequent settlement and development policies, overshadowing the Plains' agricultural viability and rich Natural Resources.