The country that hosted the 1976 Olympics, where Nadia Comăneci earned perfect 10s, was Canada. The Games were held in Montreal, Quebec, from July 17 to August 1, 1976.
Comăneci represented Romania and became the first gymnast to receive a perfect 10 at an Olympic Games. She earned her historic score on the uneven bars during the compulsory team competition on July 18. The venue's Omega scoreboard had not been designed to display 10.00, so it showed “1.00” instead, creating one of the Olympics' most famous scoring images.
Comăneci ultimately recorded seven perfect 10s in Montreal and won gold in the individual all-around, uneven bars, and balance beam. Canada is the host country, not Romania, the Soviet Union, or Japan. Montreal hosted the Olympics, while Toronto later hosted the 1976 Summer Paralympics.