USA HISTORY

Detailed explanation-1: -Stream and river crossings, steep descents and ascents, violent storms, and the persistent threat of disease among large groups of travelers were the most common challenges. Disease was the greatest threat on the trail, especially cholera, which struck wagon trains in years of heavy travel.

Detailed explanation-2: -Diseases and serious illnesses caused the deaths of nine out of ten pioneers. Such diseases as cholera, small pox, flu, measles, mumps, tuberculosis could spread quickly through an entire wagon camp. Cholera was the main scourge of the trail.

Detailed explanation-3: -Disease was the single biggest threat to the emigrants on the overland trails, but doctors were often called upon to deal with accidental injuries, as well.

Detailed explanation-4: -Some hardships of the journey were death of relatives due to accidents, indian attacks, supply shortages, weather, drowning, disease, terrain, and even medicine. A challenge faced by most travelers was to steady their usage of money along the Oregon Trail.