Here is a comprehensive summary of the article:

Fluminense Football Club, founded in 1902 by Oscar Cox in Rio de Janeiro, is the oldest football club in the state and currently competes in both the Brazilian Série A and the Campeonato Carioca. The club boasts a prestigious trophy cabinet, highlighted by the Copa Libertadores in 2023 and the Recopa Sudamericana in 2024, alongside four Brazilian championships and 33 state titles. Fluminense also made history on the global stage, finishing as runners-up at the 2023 FIFA Club World Cup to Manchester City and reaching the 2025 semi-finals after upsetting Inter Milan and Al-Hilal. Recognized as the birthplace of the Brazil national team, which played its first match at Fluminense's Estádio de Laranjeiras in 1914, the club also made history as the first recipient of the Olympic Cup in 1949. Over time, the club adopted its iconic burgundy, white, and green vertical stripes, and it is renowned for one of the world's biggest football derbies—the Fla-Flu against Flamengo—which once drew nearly 200,000 spectators at the Maracanã.