Name two difficulties that Americans faced while traveling on the Oregon Trail based on the lesson.

Disease was the greatest threat on the trail, especially cholera, which struck wagon trains in years of heavy travel. Most deaths from disease occurred east of Fort Laramie. Accidents were the second most frequent cause of death on the trail.

Explanation:

Liza is probably seeking treatment from a "cognitive psychologist".

Cognitive psychology includes the investigation of interior mental procedures—everything that go ahead inside your cerebrum, including recognition, considering, memory, consideration, dialect, critical thinking, and learning. The person who studied the cognitive psychology refers to as cognitive psychologist.