the marvel cinematic universes first phase lasted years
 feige was not sure if marvel would continue to group the films of the mcu into phases once phase three concluded in 2019 saying that it might be a new thing but by december 2018 marvel was believed to be using the term phase four
in october 2020 the marvel section of disney was restructured to include groupings of the films by phase as well as a grouping that put the films in timeline order