But they entered the stadium separately for the Paralympics after failing to agree on which version of the united flag to use.
In the biathlon - which combines skiing and shooting - the Americans took gold and silver in the women's sit ski, with Kendall Gretsch coming first and Oksana Masters second.
The ceremony culminated in the Paralympic flame being brought into the stadium, and a "moon-shaped", white cauldron being lit.
It will be the largest Winter Paralympics ever, with 570 athletes competing for 49 nations.
The first USA gold of these Paralympics was the first US gold in the biathlon, with Kendall Gretsch winning the women's 6km sitting biathlon, with teammate Oksana Masters capturing the bronze.
North Korean officials said they do "not accept the fact that Dokdo can not be marked due to political issues held in Korea", Reuters reported.
AUSTRALIAN snowboarder Simon Patmore - who only took up the sport a tick over two years ago - has become the first Australian male to medal at both a Summer and Winter Paralympic Games.
The Athletes are racing to capture a spot on the podium in six qualifying sports- alpine skiing, biathlon, cross-country skiing, para ice hockey, snowboarding and wheelchair curling.
The IPC offered the two nations' paralympic committees a similar arrangement to their Olympic counterparts, but they couldn't see eye-to-eye over the depiction of Korea on the unification flag.
A record 567 athletes will take part across nine days of competition. Cnossen is a former Navy Seal who lost both legs in an explosion in Afghanistan.
The first events begin on Saturday, with athletes competing in downhill skiing and biathlon.
Canadians will also be able to keep track of the athletes through highlights shown Monday to Friday between 4 p.m and 6 p.m. The opening ceremony for the ...