Qualification
Sixteen African nations boycotted the tournament in protest of a 1964 FIFA ruling that required the three second-round winners from the African zone to enter a play-off round against the winners of the Asian zone in order to win a place at the finals. The Africans felt that winning their zone was enough in itself to merit qualification for the finals.
Despite the Africans' absence, there was another new record number of entries for the qualifying tournament, with 70 nations taking part. After all the arguments, FIFA finally ruled that ten teams from Europe would qualify, along with four from South America, one from Asia and one from North and Central America.
Portugal and North Korea qualified for the first time. Portugal would not qualify again until 1986, while North Korea's next finals appearance was at the 2010 tournament. This was also Switzerland's last World Cup finals until 1994. Notable absentees from this tournament included 1962 semi-finalists Yugoslavia and 1962 finalists Czechoslovakia.
Read more about this topic: 1966 FIFA World Cup