FIFA World Cup

1930 FIFA World Cup
The 1930 FIFA World Cup consists of 13 teams.
 * 1 group of 4
 * 3 group of 3

1934 and 1938
The 1934 FIFA World Cup and 1938 FIFA World Cup consists of 16 teams. The first round was legally used.

The wartime
The FIFA World Cup was planned to take place in 1942 and 1946. Germany officially applied to host the 1942 FIFA World Cup during the 1936 Summer Olympics in Berlin. In June 1939, Brazil was also applied to host the tournament. The beginning of World War II prompted further plans to be cancelled, before a host country needs to be selected. The FIFA tournament did not take place, but the tournament was held in Germany instead, in which Sweden became the champions.

During World War II, the FIFA struggled to keep itself afloat, and it had no financial or personnel resources with which to plan for the peacetime tournament when hostilities ended. When the war ended in 1945, it was clear that FIFA would have no hope that they want to plan for the world cup. FIFA's first meeting was on July 1, 1946, and when they planned the FIFA World Cup, no one would like to host it.

16-team formation
From 1950 to 1978, FIFA World Cups were primarily held within the 16-team format. 2 groups of 4, 1 group of 3 and 1 group of 2 were being made in 1950, and it evolved into 4 groups of 4.

24-team formation
From 1982 to 1994, FIFA World Cups were primarily held within the 24-team format with the 6 groups of 4. The round of 16, began in 1986.

32-team formation
From 1998 to present, FIFA World Cups were primarily held within the 32-team format with the 8 groups of 4. Later on, FIFA World Cups will be extended to 48-team format (16 groups of 3).