Final answer:
Without the provided map, it's not possible to accurately determine which number corresponds to the Butterfield-Overland Trail. The trail was a significant route for mail and passengers in the 19th century and differed from trails primarily used for westward migration.
Step-by-step explanation:
The question is asking to identify the number that corresponds to the Butterfield-Overland Trail on a map of western trails used during westward migration in the United States. Unfortunately, the map or list of numbered trails needed to answer this question has not been provided. Without this specific information, we cannot accurately determine which number represents the Butterfield-Overland Trail.
The Butterfield-Overland Trail was an important 19th-century route for mail and passengers between St. Louis, Missouri and San Francisco, California. This trail was different from other pioneer trails like the Oregon Trail or California Trail, as it was not primarily used for migration but rather for communication and transportation purposes. The route was established by John Butterfield's company to deliver mail and passengers quickly across the western territories, following the Gadsden Purchase that made the southern overland route possible.
Pioneers faced many struggles during westward expansion, traveling across uncharted territories and encountering various challenges. Lessons from history, such as the expansion across these trails, highlight the struggles of settlers, the dangers they faced, and the American desire to expand into new territories such as California and Oregon, a concept known as Manifest Destiny.