This is Team USA's 100th gold medal in Winter Olympics history.
Norway's Ragnhild Mowinckel was just 0.09 secs behind Goggia, while Vonn took bronze.
"I just wish he was here, and I wish he could've watched me", she said.
The bubbly 25-year-old from Bergamo clocked one minute, 39.22 seconds to give Italy its second downhill gold and a first since Zeno Colo won the men's race in Oslo in 1952.
That's a lesson she learned from the super-G a few days earlier, when she finished 11th. Choi also struggled with finding the right skate boots and suffered from ankle injuries yet persevered and earned her spot at the Olympics.
"It was definitely unexpected", Tennell said of her fall on a triple toe loop, "but things happen".
At the height of the women's 1,500 meters semi-final race, Elise Christie of Britain and Li Jinyu of China crashed into each other, which allowed Choi Min-jeong of South Korea to win.
That's the only shade of medal that has eluded the Americans since 1998, the last time they won it all in Nagano when women's hockey made its Olympic debut.
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After winning her fourth medal here, Bjoergen captured her 14th Winter Games medal, the most of any athlete in the world.
"I feel like its 99.9 percent sure that I won't but who knows, maybe something will come out and they will fix my knee up and I will be like robo-knee and ski like 10 more years and that would be ideal".
"When I push off from the starting gate the world disappears, it doesn't matter, it doesn't count if you have pain or not".
The 37-year-old and Maiken Caspersen Falla finished in 15 minutes and 59.44 seconds, 2.97 seconds more than that of American duo of Jessica Diggins and Kikkan Randall, who won the US first ever Olympic cross country gold. I'm proud to have competed for my country. I tried to stay on the flawless line.
"It's very special to have them here, especially my dad, " Vonn said. Dabbing away tears, she said: "It's sad".
"This was good, but here I realized that though this duel was really good, it wouldn't have helped me out so much because I have to be focused on myself". Of course, I'd have loved a gold medal but, honestly, this is fantastic.
"It just shows the work we have done the last four years", added Samuel Girard, who won gold in the men's 1,000m.