Short answer: Argentina, beating France on penalties after a 3-3 final. Messi's first World Cup title.
Argentina won the 2022 World Cup in Qatar — beating France 4-2 on penalties after a 3-3 final draw. Messi's first WC title, Mbappé scored a hat-trick in the final. Argentina's third WC overall (1978, 1986, 2022). See Messi's page.