Aspects of this topic are discussed in the following places at Britannica.
The course of the race, roughly 1,100 miles (1,770 km) long, partially follows the old Iditarod Trail dogsled mail route blazed from the coastal towns of Seward and Knik to the goldfields and mining camps of northwest Alaska in the early 1900s; sled teams delivered mail and supplies to such towns as Nome and Iditarod and carried out gold. The trail declined in use in the 1920s, when the...
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