The peerless trio of Kim Woo-jin, Ku Bon-chan and Lee Seung-yun roared to a 6-0 win on a baking hot day at the Sambodromo, clinching South Korea's fifth team title and fourth in the last five Olympics.
The US, who ended the South Koreans' run of three titles in the London semi-finals, were left with a second successive silver after their opponents closed out the match in style with a run of perfect scores.
Chang claims women's individual gold for South Korea
Australia celebrated their first archery medal in 12 years by defeating China in the bronze medal play-off.
World number one Kim knocked out in huge upset
Brilliant Kim sets 72-arrow world record