The Oregon-California Trails Association is an interdisciplinary organization based at Independence, Missouri, United States. OCTA is dedicated to the preservation and protection of overland emigrant trails and the emigrant experience.
OCTA Chapters work closely with National Trails System partners to help interpret and sustain the quality of outdoor recreation experiences along these trail corridors. For example, OCTA's guide to Mapping Emigrant Trails (MET Manual)  became the National Park Service's benchmark protocol for GPS-assisted topographical mapping along other historic and scenic trails.
Three major historical trails crossed America's western territories as wagon train routes to Santa Fe, Oregon, and California.
The Santa Fe Trail began in 1821 as a 900-mile (1,400 km) foreign trade route to New Mexico. It was unique in American History due to its overland commerce routes rather than seafaring transportation.
Other pioneers forked off on the equally long and grueling California Trail to seek their fortunes in the gold fields.
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