President Thomas Jefferson commissioned the Corps of Discovery Expedition(1804-06), led by Meriwether Lewis and William Clark, to explore the territory acquired in the Louisiana Purchase, among other objectives. In 1801, Spain signed asecret<span> treaty with France to </span>return<span> Louisiana Territory to France.</span>
Temperature, food, pollutants, population density, sound, light, and parasites.
The Answer You're Looking For Is:
~C) Strong Character.
Hope this helps.
It would be caravans i think