Captain Marvel states that Avengers was initiated in 1995, which means almost 25 years ago. Then why Nick Fury took so long to gather all the powerful heroes of Earth together. He could have done it long before. Well, if you want to know the answer, then stay tuned with Filmozo.
We all know that Marvel studio first debuted in 2008. They had visualized their mind that they will create an interconnected series of the film where all the superheroes will be there. Since then, Nick has made himself busy bringing all the powerful superheroes in the movie, as shown in Avengers. Now, the question comes, why he waited such a long time when he incorporated the plan in his mind in 1995, why he made the audience wait for more than two decades.

Until phase 3 of MCU, the story of Captain Marvel was not correctly decided. Nick remained busy with his other projects, but he always had the plan to gather all the superheroes together. However, there were no specific reasons provided, apparently why Nick made us wait for a long time. It might also be stated that twenty-five years ago, the technology was not improved, so maybe Nick delayed his project’s postponed reason.
Sources revealed that Fury was experimenting on the Tesseract in the Avengers. He explained to Captain America and Iron Man about the probable death of Phil Coulson. It is one way of protecting the Earth until and unless any other attack comes on the way.
He also explained the plot of the Avengers and thought that it would be riskier to portray so many superheroes fighting the battle. Fury had many plans and ideas in his mind, but unfortunately, he did not develop them all at a time.

A female member once inquired of Fury regarding the involvement of the Avengers. She explained that she is hearing that the Avengers initiative was shut down. From here, we can conclude that it became difficult for Nick to come out of the project. He had the idea in his mind since 1995, but unfortunately, he could not make it a success at that time. It was expected that the officers under whom Fury used to work at that time might reject the plan. Fury worked hard and made his position.
Fury started to work on his plan, and after that, he created history by assembling all the superheroes to work together. Well, it remains uncertain what would happen for the MCU if we follow the infinity saga. However, Fury confirms that Earth will remain safe until and unless any alien attacks the planet.