Short answers, pulled from the story.
West Germany won the 1990 FIFA World Cup, defeating Argentina 1-0 in the final at the Stadio Olimpico in Rome. It was West Germany's third World Cup title, and their final tournament before reunification with East Germany in October 1990.
The 1990 World Cup averaged 2.21 goals per game, a record low that still stands in World Cup history. A total of 115 goals were scored across 52 matches.
Roger Milla was a 38-year-old Cameroonian forward who came out of international retirement at the personal request of Cameroonian President Paul Biya to join the 1990 squad. He scored four goals coming off the bench, helping Cameroon become the first African team to reach the quarter-finals of a World Cup.
The defensive play at the 1990 World Cup prompted two lasting rule changes: the back-pass rule, introduced in time for the 1994 tournament, which prevented goalkeepers from picking up deliberate passes from teammates; and the award of three points for a win instead of two, both introduced to encourage attacking play.
The 1990 World Cup was the last appearance for West Germany (before reunification), the Soviet Union, Yugoslavia, and Czechoslovakia, all nations that dissolved or restructured before the next World Cup in 1994.
West German manager Franz Beckenbauer became the first person to both captain and manage a World Cup winning team, having captained West Germany to the title in 1974 and then managed them to victory in 1990. Only Brazil's Mario Zagallo had previously won the World Cup as both a player and a manager.