Which option most accurately evaluates the role of the oregon trail in westward expansion? its role was essential; fur traders used the trail as a means of conducting their trade with minimized threat of native american attacks. its role was substantial; miners used the trail as a safe route as they attempted to construct a railroad across the west. its role was critical; it was the longest and most famous route traveled by pioneers looking for rich, fertile farmland in the west. its role was minimal; some pioneers traveled along this route, but many more used the old spanish and