Summer Olympic Games demand for tickets to all levels of each event, there was controversy when seats set aside for sponsors and National Delegations went unused in the early days. A system of reallocation was put in place so the empty seats were filled throughout the Games. Rio de Janeiro, Brazil hosted the 2016 Summer Olympics, becoming the third city in the Southern Hemisphere to host the Olympic Games after Melbourne, Australia, in 1956 and Sydney, Australia, in 2000, and the first South American city to host the Olympics. The preparation for these Games was overshadowed by controversies, including the instability of Brazil's
Summer Olympic Games the first athlete to ever win the distance double twice. Following the Soviet Union's 1979 invasion of Afghanistan, 66 nations, including the United States, Canada, West Germany, and Japan, boycotted the 1980 games held in Moscow. Eighty nations were represented at the Moscow Games – the smallest number since 1956. The boycott contributed to the 1980 Games being a less publicised and less competitive affair, which was dominated by the host country. In 1984 the Soviet Union and 13 Soviet allies reciprocated by boycotting the 1984 Summer Olympics in Los Angeles. Romania, notably, was one of the nations in the