USA won their fifth successive Olympic gold medal as their quartet eased to victory at London 2012.
The team of Deedee Trotter, Allyson Felix, Francena McCorory and Sanya Richards-Ross finished more than three seconds ahead of nearest rivals Russia who took silver.
Jamaica beat off the challenge of Ukraine to take bronze.
Britain, who included Perri Shakes-Drayton and Christine Ohuruogu in their line-up, finished fifth.
USA were the fastest team in qualifying, finishing a second a head of nearest rivals Russia, and they continued their good form.
Victory never looked in doubt after the first changeover and the remaining trio edged further clear of the rest of the field.
Richards-Ross, who won gold in the individual 400m, then carried the baton home, as they finished just 1.8 seconds outside the world and Olympic record.
The top six teams all ran a season's best time on the night.
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