The British colonies of North America were established at the beginning of the seventeenth century, once there they were about 150 years under British rule until the Independence of the United States in 1776. During all this time the life of the colonists and Creoles was on the east coast of the United States because the Appalachian mountain range to the west made it difficult to expand westward. Many tried to cross, however, on the way they suffered from strange diseases, dehydration, injuries, and adverse weather conditions that made this task almost impossible. In the 18th century after the Louisiana Purchase, President Thomas Jefferson commissioned several expeditions to reach the West Coast to learn about and exercise dominion over the acquired territories. So the correct answer is B.
