The Americans defeated runner-up Sweden by .19 seconds.
Norway won bronze.
The victory meant Team USA ended their 42-year Olympic medal drought in cross-country skiing. NBC Olympics reports that Diggins and Randall are the first American women to win an Olympic medal in cross-country skiing.
Before their win on Wednesday, Bill Koch was the only American cross-country skier to earn an Olympic medal. Koch won silver in the men's 30km in 1976 in Innsbruck, Austria.