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MCU's X-Men Setup Secretly Began 11 Years Ago In Captain America 1
Marvel Studios actually began subtly setting up the X-Men, including Wolverine and Professor X, in the MCU all the way back in Captain America: The First Avenger. When Marvel launched the MCU back in 2008, they had to focus on superheroes who were, at the time, generally considered second-tier. The company had previously sold the film rights to many of their most popular heroes, notably the X-Men, the Fantastic Four, and Spider-Man, meaning they were unable to make their own movies starring these characters.