No 8 Cam Dolan scored a hat-trick as the USA thrashed arch-rivals Canada 42-17 in Halifax on Saturday.
Russia picked up their first-ever win against Canada with a resounding 43-20 victory in Ottowa on Saturday.
Scotland scored seven tries in their convincing 48-10 win against Canada in Alberta on Saturday.
Soso Matiashvili scored 34 points to guide Georgia to a 54-22 victory over Canada in Tbilisi on Saturday.
Canada crushed Hong Kong 98-0, while there were also wins for England, New Zealand, the USA, Ireland and France on day one of the Women’s World Cup in Dublin.