Final answer:
Expeditions and migrations in history faced challenges like worsening environmental conditions, supply shortages, and the expense and difficulty of travel. The Lewis and Clark Expedition dealt with severe weather and interactions with wildlife and indigenous tribes, while the reintroduction of the horse greatly affected the lifestyle of Plains groups.
Step-by-step explanation:
Throughout history, expeditions and migrations have faced numerous challenges and hardships, stemming from a variety of sources. An example of such difficulties is during the fourteenth century, when many migrated from their homes in search of more hospitable conditions due to worsening environmental conditions. This period saw people struggling with adverse weather conditions, illness, and sheer expense of travel, as most means of transportation like horses and carts were beyond the means of the average person.
Furthermore, during the war times, supply problems were a common challenge. The supply shortages were a critical issue, as evidenced by the hardships faced by German troops during their advance on Moscow in World War II and the American revolutionaries during the Revolutionary War. These conditions included shortages of food, fuel, and equipment, which were compounded by environmental factors such as poor weather and dangerous travel conditions.
In the context of the early American frontier exploration, the Lewis and Clark Expedition faced their unique set of challenges, including fierce storms, an onslaught of insects, unexpected wildlife encounters, and the need to create peaceful relationships with Indigenous tribes. Similarly, when discussing the transformation of Plains groups from agriculturalists to hunter/gatherers, factors such as the reintroduction of the horse to North America played a significant role in changing their way of life.