Thereafter, a Jamboree has been held every four years. There are two exceptions to this: no Jamboree was held between 1937 and 1947 because of the Second World War, and the 1979 Jamboree, which was to be held in Iran, was cancelled due to the political upheaval in the region at that time. The Jamboree has been held in different countries around the world. The first seven Jamborees were held in Europe. The eighth World Jamboree was held in North America where the tradition of moving the Jamboree among the continents began. As yet, Africa has not hosted a jamboree.