Short answers, pulled from the story.
The Yugoslavia national football team played its debut match at the Summer Olympics in Antwerp during 1920. The Football Federation founded in Zagreb in 1919 under the name Jugoslavenski nogometni savez had just been admitted into FIFA.
Yugoslavia fielded the youngest squad at the inaugural World Cup with an average age of just under 22 years old. Players like Milovan Jakšić, Branislav Sekulić, and Aleksandar Tirnanić formed this historic lineup that finished fourth after a famous win versus Brazil.
Dragan Džajić holds the record for the most national team caps at 85 between 1964 and 1979. Stjepan Bobek is the best scorer with 38 goals between 1946 and 1956 while Zlatko Vujović earned 70 caps scoring 25 goals from 1979 to 1990.
The decision was made on the 31st of May 1992 due to United Nations Security Council Resolution 757 which imposed sanctions on Yugoslavia. The ban occurred just 10 days before the competition commenced despite the team having finished top of their qualifying group.
The Serbia and Montenegro national team continued under Yugoslavia's naming until 2003 when the country and team were renamed Serbia and Montenegro. The Serbia national football team inherited Yugoslavia's spot within FIFA and UEFA considered by both organizations as the only successor of Yugoslavia and of Serbia and Montenegro.