Answer:
Pioneers and immigrants throughout the 18th century and especially between 1600 and 1870 needed an alternative to sea and railroad transport. These immigrants began to settle North America west of the Great Plains as part of the mass overland migrations of the mid-18th century. Settlers emigrating from the eastern United States were spurred by various motives, among them religious persecution and economic incentives.Two major wagon-based transportation networks, one typically starting in Missouri and the other in the Mexican province of Santa Fe de Nuevo México, served the majority of migrants during the era of Westward expansion. Three of the Missouri-based routes—the Oregon, Mormon, and California Trails—were collectively known as the Emigrant Trails. Historians have estimated at least 500,000 emigrants used these three trails between 1843 and 1869
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