The 1950 World Cup, held in Brazil, was the first to include British participants. British teams withdrew from FIFA in 1920, partly out of unwillingness to play against the countries they had been at war with, and partly as a protest against foreign influence on football,^[13] but rejoined in 1946 following FIFA's invitation.^[14] The tournament also saw the return of 1930 champions Uruguay, who had boycotted the previous two World Cups. Uruguay won the tournament again after defeating the host nation Brazil in one of the most famous matches in World Cup history, which was later called the "Maracanazo" (Portuguese: Maracanaço).

In the tournaments between 1934 and 1978, 16 teams competed in each tournament, except in 1938, when Austria was absorbed into Germany after qualifying, leaving the tournament with 15 teams, and in 1950, when India, Scotland and Turkey withdrew, leaving the tournament with 13 teams.^[15] Most of the participating nations were from Europe and South America, with a small minority from North America, Africa, Asia and Oceania. These teams were usually defeated easily by the European and South American teams. Until 1982, the only teams from outside Europe and South America to advance out of the first round were: USA, semi-finalists in 1930; Cuba, quarter-finalists in 1938; Korea DPR, quarter-finalists in 1966; and Mexico, quarter-finalists in 1970.