The Marvel Cinematic Universe has become a massively successful superhero movie franchise, and here is every MCU movie to be Marvel's highest grossing release. The franchise began in 2008 with the hope of launching an interconnected universe based on popular and obscure Marvel Comics characters. Over the last 15 years of making films and shows, MCU movies have developed a reputation for being some of the biggest box office hits of all time. This included the massive leap in popularity that the franchise received near the end of the Infinity Saga, which helped six MCU movies make over $1 billion at the worldwide box office.
https://screenrant.com/mcu-movies-highest-grossing-box-office-how-long/